mcs/mcs/cs-parser.jay

   1 %{
   2 //
   3 // cs-parser.jay: The Parser for the C# compiler
   4 //
   5 // Authors: Miguel de Icaza (miguel@gnome.org)
   6 //          Ravi Pratap     (ravi@ximian.com)
   7 //          Marek Safar     (marek.safar@gmail.com)
   8 //
   9 // Dual Licensed under the terms of the GNU GPL and the MIT X11 license
  10 //
  11 // (C) 2001 Ximian, Inc (http://www.ximian.com)
  12 // (C) 2004-2011 Novell, Inc
  13 // Copyright 2011-2012 Xamarin Inc.
  14 //
  15
  16 using System.Text;
  17 using System.IO;
  18 using System;
  19 using System.Collections.Generic;
  20
  21 namespace Mono.CSharp
  22 {
  23         /// <summary>
  24         ///    The C# Parser
  25         /// </summary>
  26         public class CSharpParser
  27         {
  28                 [Flags]
  29                 enum ParameterModifierType
  30                 {
  31                         Ref             = 1 << 1,
  32                         Out             = 1 << 2,
  33                         This    = 1 << 3,
  34                         Params  = 1 << 4,
  35                         Arglist = 1 << 5,
  36                         DefaultValue = 1 << 6,
  37
  38                         All = Ref | Out | This | Params | Arglist | DefaultValue
  39                 }
  40
  41                 static readonly object ModifierNone = 0;
  42
  43                 NamespaceContainer current_namespace;
  44                 TypeContainer current_container;
  45                 TypeDefinition current_type;
  46                 PropertyBase current_property;
  47                 EventProperty current_event;
  48                 EventField current_event_field;
  49                 FieldBase current_field;
  50
  51                 /// <summary>
  52                 ///   Current block is used to add statements as we find
  53                 ///   them.
  54                 /// </summary>
  55                 Block      current_block;
  56
  57                 BlockVariableDeclaration current_variable;
  58
  59                 Delegate   current_delegate;
  60
  61                 AnonymousMethodExpression current_anonymous_method;
  62
  63                 /// <summary>
  64                 ///   This is used by the unary_expression code to resolve
  65                 ///   a name against a parameter.
  66                 /// </summary>
  67
  68                 // FIXME: This is very ugly and it's very hard to reset it correctly
  69                 // on all places, especially when some parameters are autogenerated.
  70                 ParametersCompiled current_local_parameters;
  71
  72                 bool parsing_anonymous_method;
  73
  74                 bool async_block;
  75
  76                 ///
  77                 /// An out-of-band stack.
  78                 ///
  79                 Stack<object> oob_stack;
  80
  81                 ///
  82                 /// Controls the verbosity of the errors produced by the parser
  83                 ///
  84                 int yacc_verbose_flag;
  85
  86                 ///
  87                 /// Used by the interactive shell, flags whether EOF was reached
  88                 /// and an error was produced
  89                 ///
  90                 public bool UnexpectedEOF;
  91
  92                 ///
  93                 /// The current file.
  94                 ///
  95                 readonly CompilationSourceFile file;
  96
  97                 ///
  98                 /// Temporary Xml documentation cache.
  99                 /// For enum types, we need one more temporary store.
 100                 ///
 101                 string tmpComment;
 102                 string enumTypeComment;
 103
 104                 /// Current attribute target
 105                 string current_attr_target;
 106
 107                 ParameterModifierType valid_param_mod;
 108
 109                 bool default_parameter_used;
 110
 111                 /// When using the interactive parser, this holds the
 112                 /// resulting expression
 113                 public Class InteractiveResult;
 114
 115                 //
 116                 // Keeps track of global data changes to undo on parser error
 117                 //
 118                 public Undo undo;
 119
 120                 Stack<Linq.QueryBlock> linq_clause_blocks;
 121
 122                 ModuleContainer module;
 123
 124                 readonly CompilerContext compiler;
 125                 readonly LanguageVersion lang_version;
 126                 readonly bool doc_support;
 127                 readonly CompilerSettings settings;
 128                 readonly Report report;
 129
 130                 //
 131                 // Instead of allocating carrier array everytime we
 132                 // share the bucket for very common constructs which can never
 133                 // be recursive
 134                 //
 135                 List<Parameter> parameters_bucket;
 136
 137                 //
 138                 // Full AST support members
 139                 //
 140                 LocationsBag lbag;
 141                 List<Tuple<Modifiers, Location>> mod_locations;
 142                 Stack<Location> location_stack;
 143 %}
 144
 145 %token EOF
 146 %token NONE   /* This token is never returned by our lexer */
 147 %token ERROR            // This is used not by the parser, but by the tokenizer.
 148                         // do not remove.
 149
 150 /*
 151  *These are the C# keywords
 152  */
 153 %token FIRST_KEYWORD
 154 %token ABSTRACT
 155 %token AS
 156 %token ADD
 157 %token BASE
 158 %token BOOL
 159 %token BREAK
 160 %token BYTE
 161 %token CASE
 162 %token CATCH
 163 %token CHAR
 164 %token CHECKED
 165 %token CLASS
 166 %token CONST
 167 %token CONTINUE
 168 %token DECIMAL
 169 %token DEFAULT
 170 %token DELEGATE
 171 %token DO
 172 %token DOUBLE
 173 %token ELSE
 174 %token ENUM
 175 %token EVENT
 176 %token EXPLICIT
 177 %token EXTERN
 178 %token FALSE
 179 %token FINALLY
 180 %token FIXED
 181 %token FLOAT
 182 %token FOR
 183 %token FOREACH
 184 %token GOTO
 185 %token IF
 186 %token IMPLICIT
 187 %token IN
 188 %token INT
 189 %token INTERFACE
 190 %token INTERNAL
 191 %token IS
 192 %token LOCK
 193 %token LONG
 194 %token NAMESPACE
 195 %token NEW
 196 %token NULL
 197 %token OBJECT
 198 %token OPERATOR
 199 %token OUT
 200 %token OVERRIDE
 201 %token PARAMS
 202 %token PRIVATE
 203 %token PROTECTED
 204 %token PUBLIC
 205 %token READONLY
 206 %token REF
 207 %token RETURN
 208 %token REMOVE
 209 %token SBYTE
 210 %token SEALED
 211 %token SHORT
 212 %token SIZEOF
 213 %token STACKALLOC
 214 %token STATIC
 215 %token STRING
 216 %token STRUCT
 217 %token SWITCH
 218 %token THIS
 219 %token THROW
 220 %token TRUE
 221 %token TRY
 222 %token TYPEOF
 223 %token UINT
 224 %token ULONG
 225 %token UNCHECKED
 226 %token UNSAFE
 227 %token USHORT
 228 %token USING
 229 %token VIRTUAL
 230 %token VOID
 231 %token VOLATILE
 232 %token WHERE
 233 %token WHILE
 234 %token ARGLIST
 235 %token PARTIAL
 236 %token ARROW
 237 %token FROM
 238 %token FROM_FIRST
 239 %token JOIN
 240 %token ON
 241 %token EQUALS
 242 %token SELECT
 243 %token GROUP
 244 %token BY
 245 %token LET
 246 %token ORDERBY
 247 %token ASCENDING
 248 %token DESCENDING
 249 %token INTO
 250 %token INTERR_NULLABLE
 251 %token EXTERN_ALIAS
 252 %token REFVALUE
 253 %token REFTYPE
 254 %token MAKEREF
 255 %token ASYNC
 256 %token AWAIT
 257
 258 /* C# keywords which are not really keywords */
 259 %token GET
 260 %token SET
 261
 262 %left LAST_KEYWORD
 263
 264 /* C# single character operators/punctuation. */
 265 %token OPEN_BRACE
 266 %token CLOSE_BRACE
 267 %token OPEN_BRACKET
 268 %token CLOSE_BRACKET
 269 %token OPEN_PARENS
 270 %token CLOSE_PARENS
 271
 272 %token DOT
 273 %token COMMA
 274 %token COLON
 275 %token SEMICOLON
 276 %token TILDE
 277
 278 %token PLUS
 279 %token MINUS
 280 %token BANG
 281 %token ASSIGN
 282 %token OP_LT
 283 %token OP_GT
 284 %token BITWISE_AND
 285 %token BITWISE_OR
 286 %token STAR
 287 %token PERCENT
 288 %token DIV
 289 %token CARRET
 290 %token INTERR
 291
 292 /* C# multi-character operators. */
 293 %token DOUBLE_COLON
 294 %token OP_INC
 295 %token OP_DEC
 296 %token OP_SHIFT_LEFT
 297 %token OP_SHIFT_RIGHT
 298 %token OP_LE
 299 %token OP_GE
 300 %token OP_EQ
 301 %token OP_NE
 302 %token OP_AND
 303 %token OP_OR
 304 %token OP_MULT_ASSIGN
 305 %token OP_DIV_ASSIGN
 306 %token OP_MOD_ASSIGN
 307 %token OP_ADD_ASSIGN
 308 %token OP_SUB_ASSIGN
 309 %token OP_SHIFT_LEFT_ASSIGN
 310 %token OP_SHIFT_RIGHT_ASSIGN
 311 %token OP_AND_ASSIGN
 312 %token OP_XOR_ASSIGN
 313 %token OP_OR_ASSIGN
 314 %token OP_PTR
 315 %token OP_COALESCING
 316
 317 /* Generics <,> tokens */
 318 %token OP_GENERICS_LT
 319 %token OP_GENERICS_LT_DECL
 320 %token OP_GENERICS_GT
 321
 322 %token LITERAL
 323
 324 %token IDENTIFIER
 325 %token OPEN_PARENS_LAMBDA
 326 %token OPEN_PARENS_CAST
 327 %token GENERIC_DIMENSION
 328 %token DEFAULT_COLON
 329 %token OPEN_BRACKET_EXPR
 330
 331 // Make the parser go into eval mode parsing (statements and compilation units).
 332 %token EVAL_STATEMENT_PARSER
 333 %token EVAL_COMPILATION_UNIT_PARSER
 334 %token EVAL_USING_DECLARATIONS_UNIT_PARSER
 335
 336 %token DOC_SEE
 337
 338 //
 339 // This token is generated to trigger the completion engine at this point
 340 //
 341 %token GENERATE_COMPLETION
 342
 343 //
 344 // This token is return repeatedly after the first GENERATE_COMPLETION
 345 // token is produced and before the final EOF
 346 //
 347 %token COMPLETE_COMPLETION
 348
 349 /* Add precedence rules to solve dangling else s/r conflict */
 350 %nonassoc IF
 351 %nonassoc ELSE
 352
 353 /* Define the operator tokens and their precedences */
 354 %right ASSIGN
 355 %right OP_COALESCING
 356 %right INTERR
 357 %left OP_OR
 358 %left OP_AND
 359 %left BITWISE_OR
 360 %left BITWISE_AND
 361 %left OP_SHIFT_LEFT OP_SHIFT_RIGHT
 362 %left PLUS MINUS
 363 %left STAR DIV PERCENT
 364 %right BANG CARRET UMINUS
 365 %nonassoc OP_INC OP_DEC
 366 %left OPEN_PARENS
 367 %left OPEN_BRACKET OPEN_BRACE
 368 %left DOT
 369
 370 %start compilation_unit
 371 %%
 372
 373 compilation_unit
 374         : outer_declaration opt_EOF
 375           {
 376                 Lexer.check_incorrect_doc_comment ();
 377           }
 378         | interactive_parsing  { Lexer.CompleteOnEOF = false; } opt_EOF
 379         | documentation_parsing
 380         ;
 381
 382 outer_declaration
 383         : opt_extern_alias_directives opt_using_directives
 384         | opt_extern_alias_directives opt_using_directives namespace_or_type_declarations opt_attributes
 385           {
 386                 if ($4 != null) {
 387                         Attributes attrs = (Attributes) $4;
 388                         report.Error (1730, attrs.Attrs [0].Location,
 389                                 "Assembly and module attributes must precede all other elements except using clauses and extern alias declarations");
 390
 391                         current_namespace.UnattachedAttributes = attrs;
 392                 }
 393           }
 394         | opt_extern_alias_directives opt_using_directives attribute_sections
 395           {
 396                 module.AddAttributes ((Attributes) $3, current_namespace);
 397           }
 398         | error
 399           {
 400                 if (yyToken == Token.EXTERN_ALIAS)
 401                         report.Error (439, lexer.Location, "An extern alias declaration must precede all other elements");
 402                 else
 403                         Error_SyntaxError (yyToken);
 404           }
 405         ;
 406
 407 opt_EOF
 408         : /* empty */
 409         | EOF
 410         ;
 411
 412 extern_alias_directives
 413         : extern_alias_directive
 414         | extern_alias_directives extern_alias_directive
 415         ;
 416
 417 extern_alias_directive
 418         : EXTERN_ALIAS IDENTIFIER IDENTIFIER SEMICOLON
 419           {
 420                 var lt = (Tokenizer.LocatedToken) $2;
 421                 string s = lt.Value;
 422                 if (s != "alias") {
 423                         syntax_error (lt.Location, "`alias' expected");
 424                 } else {
 425                         if (lang_version == LanguageVersion.ISO_1)
 426                                 FeatureIsNotAvailable (lt.Location, "external alias");
 427
 428                         lt = (Tokenizer.LocatedToken) $3;
 429                         if (lt.Value == QualifiedAliasMember.GlobalAlias) {
 430                                 RootNamespace.Error_GlobalNamespaceRedefined (report, lt.Location);
 431                         }
 432
 433                         var na = new UsingExternAlias (new SimpleMemberName (lt.Value, lt.Location), GetLocation ($1));
 434                         current_namespace.AddUsing (na);
 435
 436                         lbag.AddLocation (na, GetLocation ($2), GetLocation ($4));
 437                 }
 438           }
 439         | EXTERN_ALIAS error
 440           {
 441                 Error_SyntaxError (yyToken);
 442           }
 443         ;
 444
 445 using_directives
 446         : using_directive
 447         | using_directives using_directive
 448         ;
 449
 450 using_directive
 451         : using_namespace
 452           {
 453                 if (doc_support)
 454                         Lexer.doc_state = XmlCommentState.Allowed;
 455           }
 456         ;
 457
 458 using_namespace
 459         : USING namespace_or_type_expr SEMICOLON
 460           {
 461                 var un = new UsingNamespace ((ATypeNameExpression) $2, GetLocation ($1));
 462                 current_namespace.AddUsing (un);
 463
 464                 lbag.AddLocation (un, GetLocation ($3));
 465           }
 466         | USING IDENTIFIER ASSIGN namespace_or_type_expr SEMICOLON
 467           {
 468                 var lt = (Tokenizer.LocatedToken) $2;
 469                 if (lang_version != LanguageVersion.ISO_1 && lt.Value == "global") {
 470                         report.Warning (440, 2, lt.Location,
 471                          "An alias named `global' will not be used when resolving `global::'. The global namespace will be used instead");
 472                 }
 473
 474                 var un = new UsingAliasNamespace (new SimpleMemberName (lt.Value, lt.Location), (ATypeNameExpression) $4, GetLocation ($1));
 475                 current_namespace.AddUsing (un);
 476
 477                 lbag.AddLocation (un, GetLocation ($3), GetLocation ($5));
 478           }
 479         | USING error
 480          {
 481                 Error_SyntaxError (yyToken);
 482                 $$ = null;
 483          }
 484         ;
 485
 486 //
 487 // Strictly speaking, namespaces don't have attributes but
 488 // we parse global attributes along with namespace declarations and then
 489 // detach them
 490 //
 491 namespace_declaration
 492         : opt_attributes NAMESPACE namespace_name
 493           {
 494                 Attributes attrs = (Attributes) $1;
 495                 var name = (MemberName) $3;
 496                 if (attrs != null) {
 497                         bool valid_global_attrs = true;
 498                         if ((current_namespace.DeclarationFound || current_namespace != file)) {
 499                                 valid_global_attrs = false;
 500                         } else {
 501                                 foreach (var a in attrs.Attrs) {
 502                                         if (a.ExplicitTarget == "assembly" || a.ExplicitTarget == "module")
 503                                                 continue;
 504
 505                                         valid_global_attrs = false;
 506                                         break;
 507                                 }
 508                         }
 509
 510                         if (!valid_global_attrs)
 511                                 report.Error (1671, name.Location, "A namespace declaration cannot have modifiers or attributes");
 512                 }
 513
 514                 module.AddAttributes (attrs, current_namespace);
 515
 516                 var ns = new NamespaceContainer (name, current_namespace);
 517                 current_namespace.AddTypeContainer (ns);
 518                 current_container = current_namespace = ns;
 519           }
 520           OPEN_BRACE
 521           {
 522                 if (doc_support)
 523                         Lexer.doc_state = XmlCommentState.Allowed;
 524           }
 525           opt_extern_alias_directives opt_using_directives opt_namespace_or_type_declarations CLOSE_BRACE opt_semicolon_error
 526           {
 527                 if ($11 != null)
 528                         lbag.AddLocation (current_container, GetLocation ($2), GetLocation ($5), GetLocation ($10), GetLocation ($11));
 529                 else
 530                         lbag.AddLocation (current_container, GetLocation ($2), GetLocation ($5), GetLocation ($10));
 531
 532                 current_container = current_namespace = current_namespace.Parent;
 533           }
 534         | opt_attributes NAMESPACE namespace_name
 535           {
 536                 report.Error (1514, lexer.Location, "Unexpected symbol `{0}', expecting `.' or `{{'", GetSymbolName (yyToken));
 537
 538                 var name = (MemberName) $3;
 539                 var ns = new NamespaceContainer (name, current_namespace);
 540                 lbag.AddLocation (ns, GetLocation ($2));
 541                 current_namespace.AddTypeContainer (ns);
 542           }
 543         ;
 544
 545 opt_semicolon_error
 546         : /* empty */
 547         | SEMICOLON
 548         | error
 549           {
 550                 Error_SyntaxError (yyToken);
 551                 $$ = null;
 552           }
 553         ;
 554
 555 namespace_name
 556         : IDENTIFIER
 557           {
 558                 var lt = (Tokenizer.LocatedToken) $1;
 559                 $$ = new MemberName (lt.Value, lt.Location);
 560           }
 561         | namespace_name DOT IDENTIFIER
 562           {
 563                 var lt = (Tokenizer.LocatedToken) $3;
 564                 $$ = new MemberName ((MemberName) $1, lt.Value, lt.Location);
 565           }
 566         | error
 567           {
 568                 Error_SyntaxError (yyToken);
 569                 $$ = new MemberName ("<invalid>", lexer.Location);
 570           }
 571         ;
 572
 573 opt_semicolon
 574         : /* empty */
 575         | SEMICOLON
 576         ;
 577
 578 opt_comma
 579         : /* empty */
 580         | COMMA
 581         ;
 582
 583 opt_using_directives
 584         : /* empty */
 585         | using_directives
 586         ;
 587
 588 opt_extern_alias_directives
 589         : /* empty */
 590         | extern_alias_directives
 591         ;
 592
 593 opt_namespace_or_type_declarations
 594         : /* empty */
 595         | namespace_or_type_declarations
 596         ;
 597
 598 namespace_or_type_declarations
 599         : namespace_or_type_declaration
 600         | namespace_or_type_declarations namespace_or_type_declaration
 601         ;
 602
 603 namespace_or_type_declaration
 604         : type_declaration
 605           {
 606                 if ($1 != null) {
 607                         TypeContainer ds = (TypeContainer)$1;
 608
 609                         if ((ds.ModFlags & (Modifiers.PRIVATE | Modifiers.PROTECTED)) != 0){
 610                                 report.Error (1527, ds.Location,
 611                                 "Namespace elements cannot be explicitly declared as private, protected or protected internal");
 612                         }
 613
 614                         // Here is a trick, for explicit attributes we don't know where they belong to until
 615                         // we parse succeeding declaration hence we parse them as normal and re-attach them
 616                         // when we know whether they are global (assembly:, module:) or local (type:).
 617                         if (ds.OptAttributes != null) {
 618                                 ds.OptAttributes.ConvertGlobalAttributes (ds, current_namespace, !current_namespace.DeclarationFound && current_namespace == file);
 619                         }
 620                 }
 621                 current_namespace.DeclarationFound = true;
 622           }
 623         | namespace_declaration
 624           {
 625                 current_namespace.DeclarationFound = true;
 626           }
 627         | attribute_sections CLOSE_BRACE {
 628                 current_namespace.UnattachedAttributes = (Attributes) $1;
 629                 report.Error (1518, lexer.Location, "Attributes must be attached to class, delegate, enum, interface or struct");
 630                 lexer.putback ('}');
 631           }
 632         ;
 633
 634 type_declaration
 635         : class_declaration
 636         | struct_declaration
 637         | interface_declaration
 638         | enum_declaration
 639         | delegate_declaration
 640 //
 641 // Enable this when we have handled all errors, because this acts as a generic fallback
 642 //
 643 //      | error {
 644 //              Console.WriteLine ("Token=" + yyToken);
 645 //              report.Error (1518, GetLocation ($1), "Expected class, struct, interface, enum or delegate");
 646 //        }
 647         ;
 648
 649 //
 650 // Attributes
 651 //
 652
 653 opt_attributes
 654         : /* empty */
 655         | attribute_sections
 656     ;
 657
 658 attribute_sections
 659         : attribute_section
 660           {
 661                 var sect = (List<Attribute>) $1;
 662                 $$ = new Attributes (sect);
 663           }
 664         | attribute_sections attribute_section
 665           {
 666                 Attributes attrs = $1 as Attributes;
 667                 var sect = (List<Attribute>) $2;
 668                 if (attrs == null)
 669                         attrs = new Attributes (sect);
 670                 else
 671                         attrs.AddAttributes (sect);
 672                 $$ = attrs;
 673           }
 674         ;
 675
 676 attribute_section
 677         : OPEN_BRACKET
 678           {
 679                 PushLocation (GetLocation ($1));
 680                 lexer.parsing_attribute_section = true;
 681           }
 682           attribute_section_cont
 683           {
 684                 lexer.parsing_attribute_section = false;
 685                 $$ = $3;
 686           }
 687         ;
 688
 689 attribute_section_cont
 690         : attribute_target COLON
 691           {
 692                 current_attr_target = (string) $1;
 693                 if (current_attr_target == "assembly" || current_attr_target == "module") {
 694                         Lexer.check_incorrect_doc_comment ();
 695                 }
 696           }
 697           attribute_list opt_comma CLOSE_BRACKET
 698           {
 699                 // when attribute target is invalid
 700                 if (current_attr_target == string.Empty)
 701                         $$ = new List<Attribute> (0);
 702                 else
 703                         $$ = $4;
 704
 705                 lbag.InsertLocation ($$, 0, PopLocation ());
 706                 if ($5 != null) {
 707                         lbag.AddLocation ($$, GetLocation ($2), GetLocation ($5), GetLocation ($6));
 708                 } else {
 709                         lbag.AddLocation ($$, GetLocation ($2), GetLocation ($6));
 710                 }
 711
 712                 current_attr_target = null;
 713                 lexer.parsing_attribute_section = false;
 714           }
 715         | attribute_list opt_comma CLOSE_BRACKET
 716           {
 717                 $$ = $1;
 718
 719                 lbag.InsertLocation ($$, 0, PopLocation ());
 720                 if ($2 != null) {
 721                         lbag.AddLocation ($$, GetLocation($2), GetLocation ($3));
 722                 } else {
 723                         lbag.AddLocation ($$, GetLocation($3));
 724                 }
 725           }
 726         | IDENTIFIER error
 727           {
 728                 Error_SyntaxError (yyToken);
 729
 730                 var lt = (Tokenizer.LocatedToken) $1;
 731                 var tne = new SimpleName (lt.Value, null, lt.Location);
 732
 733                 $$ = new List<Attribute> () {
 734                         new Attribute (null, tne, null, GetLocation ($1), false)
 735                 };
 736           }
 737         | error
 738           {
 739                 $$ = CheckAttributeTarget (GetTokenName (yyToken), GetLocation ($1));
 740                 $$ = null;
 741           }
 742         ;
 743
 744 attribute_target
 745         : IDENTIFIER
 746           {
 747                 var lt = (Tokenizer.LocatedToken) $1;
 748                 $$ = CheckAttributeTarget (lt.Value, lt.Location);
 749           }
 750         | EVENT  { $$ = "event"; }
 751         | RETURN { $$ = "return"; }
 752         ;
 753
 754 attribute_list
 755         : attribute
 756           {
 757                 $$ = new List<Attribute> (4) { (Attribute) $1 };
 758           }
 759         | attribute_list COMMA attribute
 760           {
 761                 var attrs = (List<Attribute>) $1;
 762                 if (attrs != null) {
 763                         attrs.Add ((Attribute) $3);
 764                         lbag.AppendTo (attrs, GetLocation ($2));
 765                 }
 766
 767                 $$ = attrs;
 768           }
 769         ;
 770
 771 attribute
 772         : attribute_name
 773           {
 774                 ++lexer.parsing_block;
 775           }
 776           opt_attribute_arguments
 777           {
 778                 --lexer.parsing_block;
 779
 780                 var tne = (ATypeNameExpression) $1;
 781                 if (tne.HasTypeArguments) {
 782                         report.Error (404, tne.Location, "Attributes cannot be generic");
 783                 }
 784
 785                 $$ = new Attribute (current_attr_target, tne, (Arguments[]) $3, GetLocation ($1), lexer.IsEscapedIdentifier (tne));
 786           }
 787         ;
 788
 789 attribute_name
 790         : namespace_or_type_expr
 791         ;
 792
 793 opt_attribute_arguments
 794         : /* empty */   { $$ = null; }
 795         | OPEN_PARENS attribute_arguments CLOSE_PARENS
 796           {
 797                 $$ = $2;
 798           }
 799         ;
 800
 801
 802 attribute_arguments
 803         : /* empty */           { $$ = null; }
 804         | positional_or_named_argument
 805           {
 806                 Arguments a = new Arguments (4);
 807                 a.Add ((Argument) $1);
 808                 $$ = new Arguments [] { a, null };
 809           }
 810         | named_attribute_argument
 811           {
 812                 Arguments a = new Arguments (4);
 813                 a.Add ((Argument) $1);
 814                 $$ = new Arguments [] { null, a };
 815           }
 816     | attribute_arguments COMMA positional_or_named_argument
 817           {
 818                 Arguments[] o = (Arguments[]) $1;
 819                 if (o [1] != null) {
 820                         report.Error (1016, ((Argument) $3).Expr.Location, "Named attribute arguments must appear after the positional arguments");
 821                         o [0] = new Arguments (4);
 822                 }
 823
 824                 Arguments args = ((Arguments) o [0]);
 825                 if (args.Count > 0 && !($3 is NamedArgument) && args [args.Count - 1] is NamedArgument)
 826                         Error_NamedArgumentExpected ((NamedArgument) args [args.Count - 1]);
 827
 828                 args.Add ((Argument) $3);
 829           }
 830     | attribute_arguments COMMA named_attribute_argument
 831           {
 832                 Arguments[] o = (Arguments[]) $1;
 833                 if (o [1] == null) {
 834                         o [1] = new Arguments (4);
 835                 }
 836
 837                 ((Arguments) o [1]).Add ((Argument) $3);
 838           }
 839     ;
 840
 841 positional_or_named_argument
 842         : expression
 843           {
 844                 $$ = new Argument ((Expression) $1);
 845           }
 846         | named_argument
 847         | error
 848           {
 849                 Error_SyntaxError (yyToken);
 850                 $$ = null;
 851           }
 852         ;
 853
 854 named_attribute_argument
 855         : IDENTIFIER ASSIGN
 856           {
 857                 ++lexer.parsing_block;
 858           }
 859           expression
 860           {
 861                 --lexer.parsing_block;
 862                 var lt = (Tokenizer.LocatedToken) $1;
 863                 $$ = new NamedArgument (lt.Value, lt.Location, (Expression) $4);
 864                 lbag.AddLocation ($$, GetLocation($2));
 865           }
 866         ;
 867
 868 named_argument
 869         : identifier_inside_body COLON opt_named_modifier expression
 870           {
 871                 if (lang_version <= LanguageVersion.V_3)
 872                         FeatureIsNotAvailable (GetLocation ($1), "named argument");
 873
 874                 // Avoid boxing in common case (no modifier)
 875                 var arg_mod = $3 == null ? Argument.AType.None : (Argument.AType) $3;
 876
 877                 var lt = (Tokenizer.LocatedToken) $1;
 878                 $$ = new NamedArgument (lt.Value, lt.Location, (Expression) $4, arg_mod);
 879                 lbag.AddLocation ($$, GetLocation($2));
 880           }
 881         ;
 882
 883 opt_named_modifier
 884         : /* empty */   { $$ = null; }
 885         | REF
 886           {
 887                 $$ = Argument.AType.Ref;
 888           }
 889         | OUT
 890           {
 891                 $$ = Argument.AType.Out;
 892           }
 893         ;
 894
 895 opt_class_member_declarations
 896         : /* empty */
 897         | class_member_declarations
 898         ;
 899
 900 class_member_declarations
 901         : class_member_declaration
 902           {
 903                 lexer.parsing_modifiers = true;
 904           }
 905         | class_member_declarations class_member_declaration
 906           {
 907                 lexer.parsing_modifiers = true;
 908           }
 909         ;
 910
 911 class_member_declaration
 912         : constant_declaration
 913         | field_declaration
 914         | method_declaration
 915         | property_declaration
 916         | event_declaration
 917         | indexer_declaration
 918         | operator_declaration
 919         | constructor_declaration
 920         | destructor_declaration
 921         | type_declaration
 922         | attributes_without_members
 923         | incomplete_member
 924         | error
 925           {
 926                 report.Error (1519, lexer.Location, "Unexpected symbol `{0}' in class, struct, or interface member declaration",
 927                         GetSymbolName (yyToken));
 928                 $$ = null;
 929                 lexer.parsing_generic_declaration = false;
 930           }
 931         ;
 932
 933 struct_declaration
 934         : opt_attributes
 935           opt_modifiers
 936           opt_partial
 937           STRUCT
 938           {
 939           }
 940           type_declaration_name
 941           {
 942                 lexer.ConstraintsParsing = true;
 943                 push_current_container (new Struct (current_container, (MemberName) $6, (Modifiers) $2, (Attributes) $1), $3);
 944           }
 945           opt_class_base
 946           opt_type_parameter_constraints_clauses
 947           {
 948                 lexer.ConstraintsParsing = false;
 949
 950                 if ($9 != null)
 951                         current_container.SetConstraints ((List<Constraints>) $9);
 952
 953                 if (doc_support)
 954                         current_container.PartialContainer.DocComment = Lexer.consume_doc_comment ();
 955
 956                 lbag.AddMember (current_container, mod_locations, GetLocation ($4));
 957
 958                 lexer.parsing_modifiers = true;
 959           }
 960           OPEN_BRACE
 961           {
 962                 if (doc_support)
 963                         Lexer.doc_state = XmlCommentState.Allowed;
 964           }
 965           opt_class_member_declarations CLOSE_BRACE
 966           {
 967                 --lexer.parsing_declaration;
 968                 if (doc_support)
 969                         Lexer.doc_state = XmlCommentState.Allowed;
 970           }
 971           opt_semicolon
 972           {
 973                 lbag.AppendToMember (current_container, GetLocation ($11), GetLocation ($14), GetLocation ($16));
 974                 $$ = pop_current_class ();
 975           }
 976         | opt_attributes opt_modifiers opt_partial STRUCT error
 977           {
 978                 Error_SyntaxError (yyToken);
 979           }
 980         ;
 981
 982 constant_declaration
 983         : opt_attributes
 984           opt_modifiers
 985           CONST type IDENTIFIER
 986           {
 987                 var lt = (Tokenizer.LocatedToken) $5;
 988                 var mod = (Modifiers) $2;
 989                 current_field = new Const (current_type, (FullNamedExpression) $4, mod, new MemberName (lt.Value, lt.Location), (Attributes) $1);
 990                 current_type.AddMember (current_field);
 991
 992                 if ((mod & Modifiers.STATIC) != 0) {
 993                         report.Error (504, current_field.Location, "The constant `{0}' cannot be marked static", current_field.GetSignatureForError ());
 994                 }
 995
 996                 $$ = current_field;
 997           }
 998           constant_initializer opt_constant_declarators SEMICOLON
 999           {
1000                 if (doc_support) {
1001                         current_field.DocComment = Lexer.consume_doc_comment ();
1002                         Lexer.doc_state = XmlCommentState.Allowed;
1003                 }
1004
1005                 current_field.Initializer = (ConstInitializer) $7;
1006                 lbag.AddMember (current_field, mod_locations, GetLocation ($3), GetLocation ($9));
1007                 current_field = null;
1008           }
1009         | opt_attributes
1010           opt_modifiers
1011           CONST type error
1012           {
1013                 Error_SyntaxError (yyToken);
1014
1015                 current_type.AddMember (new Const (current_type, (FullNamedExpression) $4, (Modifiers) $2, MemberName.Null, (Attributes) $1));
1016           }
1017         ;
1018
1019 opt_constant_declarators
1020         : /* empty */
1021         | constant_declarators
1022         ;
1023
1024 constant_declarators
1025         : constant_declarator
1026           {
1027                 current_field.AddDeclarator ((FieldDeclarator) $1);
1028           }
1029         | constant_declarators constant_declarator
1030           {
1031                 current_field.AddDeclarator ((FieldDeclarator) $2);
1032           }
1033         ;
1034
1035 constant_declarator
1036         : COMMA IDENTIFIER constant_initializer
1037           {
1038                 var lt = (Tokenizer.LocatedToken) $2;
1039                 $$ = new FieldDeclarator (new SimpleMemberName (lt.Value, lt.Location), (ConstInitializer) $3);
1040                 lbag.AddLocation ($$, GetLocation ($1));
1041           }
1042         ;
1043
1044 constant_initializer
1045         : ASSIGN
1046           {
1047                 ++lexer.parsing_block;
1048           }
1049           constant_initializer_expr
1050           {
1051                 --lexer.parsing_block;
1052                 $$ = new ConstInitializer (current_field, (Expression) $3, GetLocation ($1));
1053           }
1054         | error
1055           {
1056                 report.Error (145, lexer.Location, "A const field requires a value to be provided");
1057                 $$ = null;
1058           }
1059         ;
1060
1061 constant_initializer_expr
1062         : constant_expression
1063         | array_initializer
1064         ;
1065
1066 field_declaration
1067         : opt_attributes
1068           opt_modifiers
1069           member_type IDENTIFIER
1070           {
1071                 lexer.parsing_generic_declaration = false;
1072
1073                 FullNamedExpression type = (FullNamedExpression) $3;
1074                 if (type.Type != null && type.Type.Kind == MemberKind.Void)
1075                         report.Error (670, GetLocation ($3), "Fields cannot have void type");
1076
1077                 var lt = (Tokenizer.LocatedToken) $4;
1078                 current_field = new Field (current_type, type, (Modifiers) $2, new MemberName (lt.Value, lt.Location), (Attributes) $1);
1079                 current_type.AddField (current_field);
1080                 $$ = current_field;
1081           }
1082           opt_field_initializer
1083           opt_field_declarators
1084           SEMICOLON
1085           {
1086                 if (doc_support) {
1087                         current_field.DocComment = Lexer.consume_doc_comment ();
1088                         Lexer.doc_state = XmlCommentState.Allowed;
1089                 }
1090
1091                 lbag.AddMember (current_field, mod_locations, GetLocation ($8));
1092                 $$ = current_field;
1093                 current_field = null;
1094           }
1095         | opt_attributes
1096           opt_modifiers
1097           FIXED simple_type IDENTIFIER
1098           {
1099                 if (lang_version < LanguageVersion.ISO_2)
1100                         FeatureIsNotAvailable (GetLocation ($3), "fixed size buffers");
1101
1102                 var lt = (Tokenizer.LocatedToken) $5;
1103                 current_field = new FixedField (current_type, (FullNamedExpression) $4, (Modifiers) $2,
1104                         new MemberName (lt.Value, lt.Location), (Attributes) $1);
1105
1106                 current_type.AddField (current_field);
1107           }
1108           fixed_field_size opt_fixed_field_declarators SEMICOLON
1109           {
1110                 if (doc_support) {
1111                         current_field.DocComment = Lexer.consume_doc_comment ();
1112                         Lexer.doc_state = XmlCommentState.Allowed;
1113             }
1114
1115                 current_field.Initializer = (ConstInitializer) $7;
1116                 lbag.AddMember (current_field, mod_locations, GetLocation ($9));
1117                 $$ = current_field;
1118             current_field = null;
1119           }
1120         | opt_attributes
1121           opt_modifiers
1122           FIXED simple_type error
1123           SEMICOLON
1124           {
1125                 report.Error (1641, GetLocation ($5), "A fixed size buffer field must have the array size specifier after the field name");
1126           }
1127         ;
1128
1129 opt_field_initializer
1130         : /* empty */
1131         | ASSIGN
1132           {
1133                 ++lexer.parsing_block;
1134                 current_local_parameters = ParametersCompiled.EmptyReadOnlyParameters;
1135                 start_block (GetLocation ($1));
1136           }
1137           variable_initializer
1138           {
1139                 --lexer.parsing_block;
1140                 current_field.Initializer = (Expression) $3;
1141                 end_block (lexer.Location);
1142                 current_local_parameters = null;
1143           }
1144         ;
1145
1146 opt_field_declarators
1147         : /* empty */
1148         | field_declarators
1149         ;
1150
1151 field_declarators
1152         : field_declarator
1153           {
1154                 current_field.AddDeclarator ((FieldDeclarator) $1);
1155           }
1156         | field_declarators field_declarator
1157           {
1158                 current_field.AddDeclarator ((FieldDeclarator) $2);
1159           }
1160         ;
1161
1162 field_declarator
1163         : COMMA IDENTIFIER
1164           {
1165                 var lt = (Tokenizer.LocatedToken) $2;
1166                 $$ = new FieldDeclarator (new SimpleMemberName (lt.Value, lt.Location), null);
1167                 lbag.AddLocation ($$, GetLocation ($1));
1168           }
1169         | COMMA IDENTIFIER ASSIGN
1170           {
1171                 ++lexer.parsing_block;
1172           }
1173           variable_initializer
1174           {
1175                 --lexer.parsing_block;
1176                 var lt = (Tokenizer.LocatedToken) $2;
1177                 $$ = new FieldDeclarator (new SimpleMemberName (lt.Value, lt.Location), (Expression) $5);
1178                 lbag.AddLocation ($$, GetLocation ($1), GetLocation ($3));
1179           }
1180         ;
1181
1182 opt_fixed_field_declarators
1183         : /* empty */
1184         | fixed_field_declarators
1185         ;
1186
1187 fixed_field_declarators
1188         : fixed_field_declarator
1189           {
1190                 current_field.AddDeclarator ((FieldDeclarator) $1);
1191           }
1192         | fixed_field_declarators fixed_field_declarator
1193           {
1194                 current_field.AddDeclarator ((FieldDeclarator) $2);
1195           }
1196         ;
1197
1198 fixed_field_declarator
1199         : COMMA IDENTIFIER fixed_field_size
1200           {
1201                 var lt = (Tokenizer.LocatedToken) $2;
1202                 $$ = new FieldDeclarator (new SimpleMemberName (lt.Value, lt.Location), (ConstInitializer) $3);
1203                 lbag.AddLocation ($$, GetLocation ($1));
1204           }
1205         ;
1206
1207 fixed_field_size
1208         : OPEN_BRACKET
1209           {
1210                 ++lexer.parsing_block;
1211           }
1212           expression CLOSE_BRACKET
1213           {
1214                 --lexer.parsing_block;
1215                 $$ = new ConstInitializer (current_field, (Expression) $3, GetLocation ($1));
1216                 lbag.AddLocation ($$, GetLocation ($4));
1217           }
1218         | OPEN_BRACKET error
1219           {
1220                 report.Error (443, lexer.Location, "Value or constant expected");
1221                 $$ = null;
1222           }
1223         ;
1224
1225 variable_initializer
1226         : expression
1227         | array_initializer
1228         | error
1229           {
1230                 // It has to be here for the parent to safely restore artificial block
1231                 Error_SyntaxError (yyToken);
1232                 $$ = null;
1233           }
1234         ;
1235
1236 method_declaration
1237         : method_header
1238           {
1239                 if (doc_support)
1240                         Lexer.doc_state = XmlCommentState.NotAllowed;
1241
1242                 // Was added earlier in the case of body being eof for full ast
1243           }
1244           method_body
1245           {
1246                 Method method = (Method) $1;
1247                 method.Block = (ToplevelBlock) $3;
1248                 async_block = false;
1249
1250                 if (method.Block == null) {
1251                         method.ParameterInfo.CheckParameters (method);
1252
1253                         if ((method.ModFlags & Modifiers.ASYNC) != 0) {
1254                                 report.Error (1994, method.Location, "`{0}': The async modifier can only be used with methods that have a body",
1255                                         method.GetSignatureForError ());
1256                         }
1257                 } else {
1258                         if (current_container.Kind == MemberKind.Interface) {
1259                                 report.Error (531, method.Location, "`{0}': interface members cannot have a definition",
1260                                         method.GetSignatureForError ());
1261                         }
1262                 }
1263
1264                 current_local_parameters = null;
1265
1266                 if (doc_support)
1267                         Lexer.doc_state = XmlCommentState.Allowed;
1268           }
1269         ;
1270
1271 method_header
1272         : opt_attributes
1273           opt_modifiers
1274           member_type
1275           method_declaration_name OPEN_PARENS
1276           {
1277                 valid_param_mod = ParameterModifierType.All;
1278           }
1279           opt_formal_parameter_list CLOSE_PARENS
1280           {
1281                 valid_param_mod = 0;
1282                 MemberName name = (MemberName) $4;
1283                 current_local_parameters = (ParametersCompiled) $7;
1284
1285                 var method = Method.Create (current_type, (FullNamedExpression) $3, (Modifiers) $2,
1286                                      name, current_local_parameters, (Attributes) $1);
1287
1288                 current_type.AddMember (method);
1289
1290                 async_block = (method.ModFlags & Modifiers.ASYNC) != 0;
1291
1292                 if (doc_support)
1293                         method.DocComment = Lexer.consume_doc_comment ();
1294
1295                 lbag.AddMember (method, mod_locations, GetLocation ($5), GetLocation ($8));
1296
1297                 $$ = method;
1298
1299                 lexer.ConstraintsParsing = true;
1300           }
1301           opt_type_parameter_constraints_clauses
1302           {
1303                 lexer.ConstraintsParsing = false;
1304
1305                 if ($10 != null) {
1306                         var method = (Method) $9;
1307                         method.SetConstraints ((List<Constraints>) $10);
1308                 }
1309
1310                 $$ = $9;
1311           }
1312         | opt_attributes
1313           opt_modifiers
1314           PARTIAL
1315           VOID
1316           {
1317                 lexer.parsing_generic_declaration = true;
1318           }
1319           method_declaration_name
1320           OPEN_PARENS
1321           {
1322                 lexer.parsing_generic_declaration = false;
1323                 valid_param_mod = ParameterModifierType.All;
1324           }
1325           opt_formal_parameter_list CLOSE_PARENS
1326           {
1327                 lexer.ConstraintsParsing = true;
1328           }
1329           opt_type_parameter_constraints_clauses
1330           {
1331                 lexer.ConstraintsParsing = false;
1332                 valid_param_mod = 0;
1333
1334                 MemberName name = (MemberName) $6;
1335                 current_local_parameters = (ParametersCompiled) $9;
1336
1337                 var modifiers = (Modifiers) $2;
1338                 modifiers |= Modifiers.PARTIAL;
1339
1340                 var method = Method.Create (current_type, new TypeExpression (compiler.BuiltinTypes.Void, GetLocation ($4)),
1341                                      modifiers, name, current_local_parameters, (Attributes) $1);
1342
1343                 current_type.AddMember (method);
1344
1345                 if ($11 != null)
1346                         method.SetConstraints ((List<Constraints>) $11);
1347
1348                 if (doc_support)
1349                         method.DocComment = Lexer.consume_doc_comment ();
1350
1351                 StoreModifierLocation (Modifiers.PARTIAL, GetLocation ($3));
1352                 lbag.AddMember (method, mod_locations, GetLocation ($7), GetLocation ($10));
1353                 $$ = method;
1354           }
1355         | opt_attributes
1356           opt_modifiers
1357           member_type
1358           modifiers method_declaration_name OPEN_PARENS opt_formal_parameter_list CLOSE_PARENS
1359           {
1360                 MemberName name = (MemberName) $5;
1361                 report.Error (1585, name.Location,
1362                         "Member modifier `{0}' must precede the member type and name", ModifiersExtensions.Name ((Modifiers) $4));
1363
1364                 var method = Method.Create (current_type, (FullNamedExpression) $3,
1365                                             0, name, (ParametersCompiled) $7, (Attributes) $1);
1366
1367                 current_type.AddMember (method);
1368
1369                 current_local_parameters = (ParametersCompiled) $7;
1370
1371                 if (doc_support)
1372                         method.DocComment = Lexer.consume_doc_comment ();
1373
1374                 $$ = method;
1375           }
1376         | opt_attributes
1377           opt_modifiers
1378           member_type
1379           method_declaration_name error
1380           {
1381                 Error_SyntaxError (yyToken);
1382                 current_local_parameters = ParametersCompiled.Undefined;
1383
1384                 MemberName name = (MemberName) $4;
1385                 var method = Method.Create (current_type, (FullNamedExpression) $3, (Modifiers) $2,
1386                                                                         name, current_local_parameters, (Attributes) $1);
1387
1388                 current_type.AddMember (method);
1389
1390                 if (doc_support)
1391                         method.DocComment = Lexer.consume_doc_comment ();
1392
1393                 $$ = method;
1394           }
1395         ;
1396
1397 method_body
1398         : block
1399         | SEMICOLON             { $$ = null; }
1400         ;
1401
1402 opt_formal_parameter_list
1403         : /* empty */                   { $$ = ParametersCompiled.EmptyReadOnlyParameters; }
1404         | formal_parameter_list
1405         ;
1406
1407 formal_parameter_list
1408         : fixed_parameters
1409           {
1410                 var pars_list = (List<Parameter>) $1;
1411                 $$ = new ParametersCompiled (pars_list.ToArray ());
1412           }
1413         | fixed_parameters COMMA parameter_array
1414           {
1415                 var pars_list = (List<Parameter>) $1;
1416                 pars_list.Add ((Parameter) $3);
1417
1418                 $$ = new ParametersCompiled (pars_list.ToArray ());
1419           }
1420         | fixed_parameters COMMA arglist_modifier
1421           {
1422                 var pars_list = (List<Parameter>) $1;
1423                 pars_list.Add (new ArglistParameter (GetLocation ($3)));
1424                 $$ = new ParametersCompiled (pars_list.ToArray (), true);
1425           }
1426         | parameter_array COMMA error
1427           {
1428                 if ($1 != null)
1429                         report.Error (231, ((Parameter) $1).Location, "A params parameter must be the last parameter in a formal parameter list");
1430
1431                 $$ = new ParametersCompiled (new Parameter[] { (Parameter) $1 } );
1432           }
1433         | fixed_parameters COMMA parameter_array COMMA error
1434           {
1435                 if ($3 != null)
1436                         report.Error (231, ((Parameter) $3).Location, "A params parameter must be the last parameter in a formal parameter list");
1437
1438                 var pars_list = (List<Parameter>) $1;
1439                 pars_list.Add (new ArglistParameter (GetLocation ($3)));
1440
1441                 $$ = new ParametersCompiled (pars_list.ToArray (), true);
1442           }
1443         | arglist_modifier COMMA error
1444           {
1445                 report.Error (257, GetLocation ($1), "An __arglist parameter must be the last parameter in a formal parameter list");
1446
1447                 $$ = new ParametersCompiled (new Parameter [] { new ArglistParameter (GetLocation ($1)) }, true);
1448           }
1449         | fixed_parameters COMMA ARGLIST COMMA error
1450           {
1451                 report.Error (257, GetLocation ($3), "An __arglist parameter must be the last parameter in a formal parameter list");
1452
1453                 var pars_list = (List<Parameter>) $1;
1454                 pars_list.Add (new ArglistParameter (GetLocation ($3)));
1455
1456                 $$ = new ParametersCompiled (pars_list.ToArray (), true);
1457           }
1458         | parameter_array
1459           {
1460                 $$ = new ParametersCompiled (new Parameter[] { (Parameter) $1 } );
1461           }
1462         | arglist_modifier
1463           {
1464                 $$ = new ParametersCompiled (new Parameter [] { new ArglistParameter (GetLocation ($1)) }, true);
1465           }
1466         | error
1467           {
1468                 Error_SyntaxError (yyToken);
1469                 $$ = ParametersCompiled.EmptyReadOnlyParameters;
1470           }
1471         ;
1472
1473 fixed_parameters
1474         : fixed_parameter
1475           {
1476                 parameters_bucket.Clear ();
1477                 Parameter p = (Parameter) $1;
1478                 parameters_bucket.Add (p);
1479
1480                 default_parameter_used = p.HasDefaultValue;
1481                 $$ = parameters_bucket;
1482           }
1483         | fixed_parameters COMMA fixed_parameter
1484           {
1485                 var pars = (List<Parameter>) $1;
1486                 Parameter p = (Parameter) $3;
1487                 if (p != null) {
1488                         if (p.HasExtensionMethodModifier)
1489                                 report.Error (1100, p.Location, "The parameter modifier `this' can only be used on the first parameter");
1490                         else if (!p.HasDefaultValue && default_parameter_used)
1491                                 report.Error (1737, p.Location, "Optional parameter cannot precede required parameters");
1492
1493                         default_parameter_used |= p.HasDefaultValue;
1494                         pars.Add (p);
1495
1496                         lbag.AddLocation (p, GetLocation ($2));
1497                 }
1498
1499                 $$ = $1;
1500           }
1501         ;
1502
1503 fixed_parameter
1504         : opt_attributes
1505           opt_parameter_modifier
1506           parameter_type
1507           identifier_inside_body
1508           {
1509                 var lt = (Tokenizer.LocatedToken) $4;
1510                 $$ = new Parameter ((FullNamedExpression) $3, lt.Value, (Parameter.Modifier) $2, (Attributes) $1, lt.Location);
1511           }
1512         | opt_attributes
1513           opt_parameter_modifier
1514           parameter_type
1515           identifier_inside_body OPEN_BRACKET CLOSE_BRACKET
1516           {
1517                 var lt = (Tokenizer.LocatedToken) $4;
1518                 report.Error (1552, lt.Location, "Array type specifier, [], must appear before parameter name");
1519                 $$ = new Parameter ((FullNamedExpression) $3, lt.Value, (Parameter.Modifier) $2, (Attributes) $1, lt.Location);
1520           }
1521         | attribute_sections error
1522           {
1523                 Error_SyntaxError (yyToken);
1524                 Location l = GetLocation ($2);
1525                 $$ = new Parameter (null, null, Parameter.Modifier.NONE, (Attributes) $1, l);
1526           }
1527         | opt_attributes
1528           opt_parameter_modifier
1529           parameter_type
1530           error
1531           {
1532                 Error_SyntaxError (yyToken);
1533                 Location l = GetLocation ($4);
1534                 $$ = new Parameter ((FullNamedExpression) $3, null, (Parameter.Modifier) $2, (Attributes) $1, l);
1535           }
1536         | opt_attributes
1537           opt_parameter_modifier
1538           parameter_type
1539           identifier_inside_body
1540           ASSIGN
1541           {
1542                 ++lexer.parsing_block;
1543           }
1544           constant_expression
1545           {
1546                 --lexer.parsing_block;
1547                 if (lang_version <= LanguageVersion.V_3) {
1548                         FeatureIsNotAvailable (GetLocation ($5), "optional parameter");
1549                 }
1550
1551                 Parameter.Modifier mod = (Parameter.Modifier) $2;
1552                 if (mod != Parameter.Modifier.NONE) {
1553                         switch (mod) {
1554                         case Parameter.Modifier.REF:
1555                         case Parameter.Modifier.OUT:
1556                                 report.Error (1741, GetLocation ($2), "Cannot specify a default value for the `{0}' parameter",
1557                                         Parameter.GetModifierSignature (mod));
1558                                 break;
1559
1560                         case Parameter.Modifier.This:
1561                                 report.Error (1743, GetLocation ($2), "Cannot specify a default value for the `{0}' parameter",
1562                                         Parameter.GetModifierSignature (mod));
1563                                 break;
1564                         default:
1565                                 throw new NotImplementedException (mod.ToString ());
1566                         }
1567
1568                         mod = Parameter.Modifier.NONE;
1569                 }
1570
1571                 if ((valid_param_mod & ParameterModifierType.DefaultValue) == 0)
1572                         report.Error (1065, GetLocation ($5), "Optional parameter is not valid in this context");
1573
1574                 var lt = (Tokenizer.LocatedToken) $4;
1575                 $$ = new Parameter ((FullNamedExpression) $3, lt.Value, mod, (Attributes) $1, lt.Location);
1576                 lbag.AddLocation ($$, GetLocation ($5));
1577
1578                 if ($7 != null)
1579                         ((Parameter) $$).DefaultValue = new DefaultParameterValueExpression ((Expression) $7);
1580           }
1581         ;
1582
1583 opt_parameter_modifier
1584         : /* empty */           { $$ = Parameter.Modifier.NONE; }
1585         | parameter_modifiers
1586         ;
1587
1588 parameter_modifiers
1589         : parameter_modifier
1590           {
1591                 $$ = $1;
1592           }
1593         | parameter_modifiers parameter_modifier
1594           {
1595                 Parameter.Modifier p2 = (Parameter.Modifier)$2;
1596                 Parameter.Modifier mod = (Parameter.Modifier)$1 | p2;
1597                 if (((Parameter.Modifier)$1 & p2) == p2) {
1598                         Error_DuplicateParameterModifier (lexer.Location, p2);
1599                 } else {
1600                         switch (mod & ~Parameter.Modifier.This) {
1601                                 case Parameter.Modifier.REF:
1602                                         report.Error (1101, lexer.Location, "The parameter modifiers `this' and `ref' cannot be used altogether");
1603                                         break;
1604                                 case Parameter.Modifier.OUT:
1605                                         report.Error (1102, lexer.Location, "The parameter modifiers `this' and `out' cannot be used altogether");
1606                                         break;
1607                                 default:
1608                                         report.Error (1108, lexer.Location, "A parameter cannot have specified more than one modifier");
1609                                         break;
1610                         }
1611                 }
1612                 $$ = mod;
1613           }
1614         ;
1615
1616 parameter_modifier
1617         : REF
1618           {
1619                 if ((valid_param_mod & ParameterModifierType.Ref) == 0)
1620                         Error_ParameterModifierNotValid ("ref", GetLocation ($1));
1621
1622                 $$ = Parameter.Modifier.REF;
1623           }
1624         | OUT
1625           {
1626                 if ((valid_param_mod & ParameterModifierType.Out) == 0)
1627                         Error_ParameterModifierNotValid ("out", GetLocation ($1));
1628
1629                 $$ = Parameter.Modifier.OUT;
1630           }
1631         | THIS
1632           {
1633                 if ((valid_param_mod & ParameterModifierType.This) == 0)
1634                         Error_ParameterModifierNotValid ("this", GetLocation ($1));
1635
1636                 if (lang_version <= LanguageVersion.ISO_2)
1637                         FeatureIsNotAvailable (GetLocation ($1), "extension methods");
1638
1639                 $$ = Parameter.Modifier.This;
1640           }
1641         ;
1642
1643 parameter_array
1644         : opt_attributes params_modifier type IDENTIFIER
1645           {
1646                 var lt = (Tokenizer.LocatedToken) $4;
1647                 $$ = new ParamsParameter ((FullNamedExpression) $3, lt.Value, (Attributes) $1, lt.Location);
1648           }
1649         | opt_attributes params_modifier type IDENTIFIER ASSIGN constant_expression
1650           {
1651                 report.Error (1751, GetLocation ($2), "Cannot specify a default value for a parameter array");
1652
1653                 var lt = (Tokenizer.LocatedToken) $4;
1654                 $$ = new ParamsParameter ((FullNamedExpression) $3, lt.Value, (Attributes) $1, lt.Location);
1655           }
1656         | opt_attributes params_modifier type error
1657           {
1658                 Error_SyntaxError (yyToken);
1659
1660                 $$ = new ParamsParameter ((FullNamedExpression) $3, null, (Attributes) $1, Location.Null);
1661           }
1662         ;
1663
1664 params_modifier
1665         : PARAMS
1666           {
1667                 if ((valid_param_mod & ParameterModifierType.Params) == 0)
1668                         report.Error (1670, (GetLocation ($1)), "The `params' modifier is not allowed in current context");
1669           }
1670         | PARAMS parameter_modifier
1671           {
1672                 Parameter.Modifier mod = (Parameter.Modifier)$2;
1673                 if ((mod & Parameter.Modifier.This) != 0) {
1674                         report.Error (1104, GetLocation ($1), "The parameter modifiers `this' and `params' cannot be used altogether");
1675                 } else {
1676                         report.Error (1611, GetLocation ($1), "The params parameter cannot be declared as ref or out");
1677                 }
1678           }
1679         | PARAMS params_modifier
1680           {
1681                 Error_DuplicateParameterModifier (GetLocation ($1), Parameter.Modifier.PARAMS);
1682           }
1683         ;
1684
1685 arglist_modifier
1686         : ARGLIST
1687           {
1688                 if ((valid_param_mod & ParameterModifierType.Arglist) == 0)
1689                         report.Error (1669, GetLocation ($1), "__arglist is not valid in this context");
1690           }
1691         ;
1692
1693 property_declaration
1694         : opt_attributes
1695           opt_modifiers
1696           member_type
1697           member_declaration_name
1698           {
1699                 if (doc_support)
1700                         tmpComment = Lexer.consume_doc_comment ();
1701           }
1702           OPEN_BRACE
1703           {
1704                 var type = (FullNamedExpression) $3;
1705                 current_property = new Property (current_type, type, (Modifiers) $2,
1706                         (MemberName) $4, (Attributes) $1);
1707
1708                 if (type.Type != null && type.Type.Kind == MemberKind.Void)
1709                         report.Error (547, GetLocation ($3), "`{0}': property or indexer cannot have void type", current_property.GetSignatureForError ());
1710
1711                 current_type.AddMember (current_property);
1712                 lbag.AddMember (current_property, mod_locations, GetLocation ($6));
1713
1714                 lexer.PropertyParsing = true;
1715           }
1716           accessor_declarations
1717           {
1718                 lexer.PropertyParsing = false;
1719
1720                 if (doc_support)
1721                         current_property.DocComment = ConsumeStoredComment ();
1722           }
1723           CLOSE_BRACE
1724           {
1725                 lbag.AppendToMember (current_property, GetLocation ($10));
1726                 current_property = null;
1727           }
1728         ;
1729
1730
1731 indexer_declaration
1732         : opt_attributes opt_modifiers
1733           member_type indexer_declaration_name OPEN_BRACKET
1734           {
1735                 valid_param_mod = ParameterModifierType.Params | ParameterModifierType.DefaultValue;
1736           }
1737           opt_formal_parameter_list CLOSE_BRACKET
1738           {
1739                 valid_param_mod = 0;
1740                 var type = (FullNamedExpression) $3;
1741                 Indexer indexer = new Indexer (current_type, type, (MemberName) $4, (Modifiers) $2, (ParametersCompiled) $7, (Attributes) $1);
1742
1743                 current_property = indexer;
1744
1745                 current_type.AddIndexer (indexer);
1746                 lbag.AddMember (current_property, mod_locations, GetLocation ($5), GetLocation ($8));
1747
1748                 if (type.Type != null && type.Type.Kind == MemberKind.Void)
1749                         report.Error (620, GetLocation ($3), "`{0}': indexer return type cannot be `void'", indexer.GetSignatureForError ());
1750
1751                 if (indexer.ParameterInfo.IsEmpty) {
1752                         report.Error (1551, GetLocation ($5), "Indexers must have at least one parameter");
1753                 }
1754
1755                 if (doc_support) {
1756                         tmpComment = Lexer.consume_doc_comment ();
1757                         Lexer.doc_state = XmlCommentState.Allowed;
1758                 }
1759
1760                 lexer.PropertyParsing = true;
1761           }
1762           OPEN_BRACE accessor_declarations
1763           {
1764                 lexer.PropertyParsing = false;
1765           }
1766           CLOSE_BRACE
1767           {
1768                 if (current_property.AccessorFirst != null && current_property.AccessorFirst.Block == null)
1769                         ((Indexer) current_property).ParameterInfo.CheckParameters (current_property);
1770
1771                 if (doc_support)
1772                         current_property.DocComment = ConsumeStoredComment ();
1773
1774                 lbag.AppendToMember (current_property, GetLocation ($10), GetLocation ($13));
1775                 current_property = null;
1776           }
1777         ;
1778
1779
1780 accessor_declarations
1781         : get_accessor_declaration
1782         | get_accessor_declaration accessor_declarations
1783         | set_accessor_declaration
1784         | set_accessor_declaration accessor_declarations
1785         | error
1786           {
1787                 if (yyToken == Token.CLOSE_BRACE) {
1788                         report.Error (548, lexer.Location, "`{0}': property or indexer must have at least one accessor", current_property.GetSignatureForError ());
1789                 } else {
1790                         if (yyToken == Token.SEMICOLON)
1791                                 report.Error (1597, lexer.Location, "Semicolon after method or accessor block is not valid");
1792                         else
1793                                 report.Error (1014, GetLocation ($1), "A get or set accessor expected");
1794                 }
1795           }
1796         ;
1797
1798 get_accessor_declaration
1799         : opt_attributes opt_modifiers GET
1800           {
1801                 if ($2 != ModifierNone && lang_version == LanguageVersion.ISO_1) {
1802                         FeatureIsNotAvailable (GetLocation ($2), "access modifiers on properties");
1803                 }
1804
1805                 if (current_property.Get != null) {
1806                         report.Error (1007, GetLocation ($3), "Property accessor already defined");
1807                 }
1808
1809                 if (current_property is Indexer) {
1810                         current_property.Get = new Indexer.GetIndexerMethod (current_property, (Modifiers) $2, ((Indexer)current_property).ParameterInfo.Clone (),
1811                                 (Attributes) $1, GetLocation ($3));
1812                 } else {
1813                         current_property.Get = new Property.GetMethod (current_property,
1814                                 (Modifiers) $2, (Attributes) $1, GetLocation ($3));
1815                 }
1816
1817                 current_local_parameters = current_property.Get.ParameterInfo;
1818                 lbag.AddMember (current_property.Get, mod_locations);
1819                 lexer.PropertyParsing = false;
1820           }
1821           accessor_body
1822           {
1823                 if ($5 != null) {
1824                         current_property.Get.Block = (ToplevelBlock) $5;
1825
1826                         if (current_container.Kind == MemberKind.Interface) {
1827                                 report.Error (531, current_property.Get.Block.StartLocation,
1828                                         "`{0}': interface members cannot have a definition", current_property.Get.GetSignatureForError ());
1829                         }
1830                 }
1831
1832                 current_local_parameters = null;
1833                 lexer.PropertyParsing = true;
1834
1835                 if (doc_support)
1836                         if (Lexer.doc_state == XmlCommentState.Error)
1837                                 Lexer.doc_state = XmlCommentState.NotAllowed;
1838           }
1839         ;
1840
1841 set_accessor_declaration
1842         : opt_attributes opt_modifiers SET
1843           {
1844                 if ($2 != ModifierNone && lang_version == LanguageVersion.ISO_1) {
1845                         FeatureIsNotAvailable (GetLocation ($2), "access modifiers on properties");
1846                 }
1847
1848                 if (current_property.Set != null) {
1849                         report.Error (1007, GetLocation ($3), "Property accessor already defined");
1850                 }
1851
1852                 if (current_property is Indexer) {
1853                         current_property.Set = new Indexer.SetIndexerMethod (current_property, (Modifiers) $2,
1854                                 ParametersCompiled.MergeGenerated (compiler,
1855                                 ((Indexer)current_property).ParameterInfo, true, new Parameter (
1856                                         current_property.TypeExpression, "value", Parameter.Modifier.NONE, null, GetLocation ($3)),
1857                                         null),
1858                                 (Attributes) $1, GetLocation ($3));
1859                 } else {
1860                         current_property.Set = new Property.SetMethod (current_property, (Modifiers) $2,
1861                                 ParametersCompiled.CreateImplicitParameter (current_property.TypeExpression, GetLocation ($3)),
1862                                 (Attributes) $1, GetLocation ($3));
1863                 }
1864
1865                 current_local_parameters = current_property.Set.ParameterInfo;
1866                 lbag.AddMember (current_property.Set, mod_locations);
1867                 lexer.PropertyParsing = false;
1868           }
1869           accessor_body
1870           {
1871                 if ($5 != null) {
1872                         current_property.Set.Block = (ToplevelBlock) $5;
1873
1874                         if (current_container.Kind == MemberKind.Interface) {
1875                                 report.Error (531, current_property.Set.Block.StartLocation,
1876                                         "`{0}': interface members cannot have a definition", current_property.Set.GetSignatureForError ());
1877                         }
1878                 }
1879
1880                 current_local_parameters = null;
1881                 lexer.PropertyParsing = true;
1882
1883                 if (doc_support
1884                         && Lexer.doc_state == XmlCommentState.Error)
1885                         Lexer.doc_state = XmlCommentState.NotAllowed;
1886           }
1887         ;
1888
1889 accessor_body
1890         : block
1891         | SEMICOLON
1892           {
1893                 // TODO: lbag
1894                 $$ = null;
1895           }
1896         | error
1897           {
1898                 Error_SyntaxError (1043, yyToken, "Invalid accessor body");
1899                 $$ = null;
1900           }
1901         ;
1902
1903 interface_declaration
1904         : opt_attributes
1905           opt_modifiers
1906           opt_partial
1907           INTERFACE
1908           {
1909           }
1910           type_declaration_name
1911           {
1912                 lexer.ConstraintsParsing = true;
1913                 push_current_container (new Interface (current_container, (MemberName) $6, (Modifiers) $2, (Attributes) $1), $3);
1914                 lbag.AddMember (current_container, mod_locations, GetLocation ($4));
1915           }
1916           opt_class_base
1917           opt_type_parameter_constraints_clauses
1918           {
1919                 lexer.ConstraintsParsing = false;
1920
1921                 if ($9 != null)
1922                         current_container.SetConstraints ((List<Constraints>) $9);
1923
1924                 if (doc_support) {
1925                         current_container.PartialContainer.DocComment = Lexer.consume_doc_comment ();
1926                         Lexer.doc_state = XmlCommentState.Allowed;
1927                 }
1928
1929                 lexer.parsing_modifiers = true;
1930           }
1931           OPEN_BRACE opt_interface_member_declarations CLOSE_BRACE
1932           {
1933                 --lexer.parsing_declaration;
1934                 if (doc_support)
1935                         Lexer.doc_state = XmlCommentState.Allowed;
1936           }
1937           opt_semicolon
1938           {
1939             lbag.AppendToMember (current_container, GetLocation ($11), GetLocation ($13));
1940                 $$ = pop_current_class ();
1941           }
1942         | opt_attributes opt_modifiers opt_partial INTERFACE error
1943           {
1944                 Error_SyntaxError (yyToken);
1945           }
1946         ;
1947
1948 opt_interface_member_declarations
1949         : /* empty */
1950         | interface_member_declarations
1951         ;
1952
1953 interface_member_declarations
1954         : interface_member_declaration
1955           {
1956                 lexer.parsing_modifiers = true;
1957           }
1958         | interface_member_declarations interface_member_declaration
1959           {
1960                 lexer.parsing_modifiers = true;
1961           }
1962         ;
1963
1964 interface_member_declaration
1965         : constant_declaration
1966           {
1967                 report.Error (525, GetLocation ($1), "Interfaces cannot contain fields or constants");
1968           }
1969         | field_declaration
1970           {
1971                 report.Error (525, GetLocation ($1), "Interfaces cannot contain fields or constants");
1972           }
1973         | method_declaration
1974         | property_declaration
1975         | event_declaration
1976         | indexer_declaration
1977         | operator_declaration
1978           {
1979                 report.Error (567, GetLocation ($1), "Interfaces cannot contain operators");
1980           }
1981         | constructor_declaration
1982           {
1983                 report.Error (526, GetLocation ($1), "Interfaces cannot contain contructors");
1984           }
1985         | type_declaration
1986           {
1987                 report.Error (524, GetLocation ($1), "Interfaces cannot declare classes, structs, interfaces, delegates, or enumerations");
1988           }
1989         ;
1990
1991 operator_declaration
1992         : opt_attributes opt_modifiers operator_declarator
1993           {
1994           }
1995           operator_body
1996           {
1997                 OperatorDeclaration decl = (OperatorDeclaration) $3;
1998                 if (decl != null) {
1999                         Operator op = new Operator (
2000                                 current_type, decl.optype, decl.ret_type, (Modifiers) $2,
2001                                 current_local_parameters,
2002                                 (ToplevelBlock) $5, (Attributes) $1, decl.location);
2003
2004                         if (op.Block == null)
2005                                 op.ParameterInfo.CheckParameters (op);
2006
2007                         if (doc_support) {
2008                                 op.DocComment = tmpComment;
2009                                 Lexer.doc_state = XmlCommentState.Allowed;
2010                         }
2011
2012                         // Note again, checking is done in semantic analysis
2013                         current_type.AddOperator (op);
2014
2015                         lbag.AddMember (op, mod_locations, lbag.GetLocations (decl));
2016                 }
2017
2018                 current_local_parameters = null;
2019           }
2020         ;
2021
2022 operator_body
2023         : block
2024         | SEMICOLON { $$ = null; }
2025         ;
2026
2027 operator_type
2028         : type_expression_or_array
2029         | VOID
2030           {
2031                 report.Error (590, GetLocation ($1), "User-defined operators cannot return void");
2032                 $$ = new TypeExpression (compiler.BuiltinTypes.Void, GetLocation ($1));
2033           }
2034         ;
2035
2036 operator_declarator
2037         : operator_type OPERATOR overloadable_operator OPEN_PARENS
2038           {
2039                 valid_param_mod = ParameterModifierType.DefaultValue;
2040           }
2041           opt_formal_parameter_list CLOSE_PARENS
2042           {
2043                 valid_param_mod = 0;
2044
2045                 Location loc = GetLocation ($2);
2046                 Operator.OpType op = (Operator.OpType) $3;
2047                 current_local_parameters = (ParametersCompiled)$6;
2048
2049                 int p_count = current_local_parameters.Count;
2050                 if (p_count == 1) {
2051                         if (op == Operator.OpType.Addition)
2052                                 op = Operator.OpType.UnaryPlus;
2053                         else if (op == Operator.OpType.Subtraction)
2054                                 op = Operator.OpType.UnaryNegation;
2055                 }
2056
2057                 if (IsUnaryOperator (op)) {
2058                         if (p_count == 2) {
2059                                 report.Error (1020, loc, "Overloadable binary operator expected");
2060                         } else if (p_count != 1) {
2061                                 report.Error (1535, loc, "Overloaded unary operator `{0}' takes one parameter",
2062                                         Operator.GetName (op));
2063                         }
2064                 } else {
2065                         if (p_count > 2) {
2066                                 report.Error (1534, loc, "Overloaded binary operator `{0}' takes two parameters",
2067                                         Operator.GetName (op));
2068                         } else if (p_count != 2) {
2069                                 report.Error (1019, loc, "Overloadable unary operator expected");
2070                         }
2071                 }
2072
2073                 if (doc_support) {
2074                         tmpComment = Lexer.consume_doc_comment ();
2075                         Lexer.doc_state = XmlCommentState.NotAllowed;
2076                 }
2077
2078                 $$ = new OperatorDeclaration (op, (FullNamedExpression) $1, loc);
2079                 lbag.AddLocation ($$, GetLocation ($2), GetLocation ($3), GetLocation ($4), GetLocation ($7));
2080           }
2081         | conversion_operator_declarator
2082         ;
2083
2084 overloadable_operator
2085 // Unary operators:
2086         : BANG   { $$ = Operator.OpType.LogicalNot; }
2087         | TILDE  { $$ = Operator.OpType.OnesComplement; }
2088         | OP_INC { $$ = Operator.OpType.Increment; }
2089         | OP_DEC { $$ = Operator.OpType.Decrement; }
2090         | TRUE   { $$ = Operator.OpType.True; }
2091         | FALSE  { $$ = Operator.OpType.False; }
2092 // Unary and binary:
2093         | PLUS { $$ = Operator.OpType.Addition; }
2094         | MINUS { $$ = Operator.OpType.Subtraction; }
2095 // Binary:
2096         | STAR { $$ = Operator.OpType.Multiply; }
2097         | DIV {  $$ = Operator.OpType.Division; }
2098         | PERCENT { $$ = Operator.OpType.Modulus; }
2099         | BITWISE_AND { $$ = Operator.OpType.BitwiseAnd; }
2100         | BITWISE_OR { $$ = Operator.OpType.BitwiseOr; }
2101         | CARRET { $$ = Operator.OpType.ExclusiveOr; }
2102         | OP_SHIFT_LEFT { $$ = Operator.OpType.LeftShift; }
2103         | OP_SHIFT_RIGHT { $$ = Operator.OpType.RightShift; }
2104         | OP_EQ { $$ = Operator.OpType.Equality; }
2105         | OP_NE { $$ = Operator.OpType.Inequality; }
2106         | OP_GT { $$ = Operator.OpType.GreaterThan; }
2107         | OP_LT { $$ = Operator.OpType.LessThan; }
2108         | OP_GE { $$ = Operator.OpType.GreaterThanOrEqual; }
2109         | OP_LE { $$ = Operator.OpType.LessThanOrEqual; }
2110         ;
2111
2112 conversion_operator_declarator
2113         : IMPLICIT OPERATOR type OPEN_PARENS
2114           {
2115                 valid_param_mod = ParameterModifierType.DefaultValue;
2116           }
2117           opt_formal_parameter_list CLOSE_PARENS
2118           {
2119                 valid_param_mod = 0;
2120
2121                 Location loc = GetLocation ($2);
2122                 current_local_parameters = (ParametersCompiled)$6;
2123
2124                 if (current_local_parameters.Count != 1) {
2125                         report.Error (1535, loc, "Overloaded unary operator `implicit' takes one parameter");
2126                 }
2127
2128                 if (doc_support) {
2129                         tmpComment = Lexer.consume_doc_comment ();
2130                         Lexer.doc_state = XmlCommentState.NotAllowed;
2131                 }
2132
2133                 $$ = new OperatorDeclaration (Operator.OpType.Implicit, (FullNamedExpression) $3, loc);
2134                 lbag.AddLocation ($$, GetLocation ($1), GetLocation ($2), GetLocation ($4), GetLocation ($7));
2135           }
2136         | EXPLICIT OPERATOR type OPEN_PARENS
2137           {
2138                 valid_param_mod = ParameterModifierType.DefaultValue;
2139           }
2140           opt_formal_parameter_list CLOSE_PARENS
2141           {
2142                 valid_param_mod = 0;
2143
2144                 Location loc = GetLocation ($2);
2145                 current_local_parameters = (ParametersCompiled)$6;
2146
2147                 if (current_local_parameters.Count != 1) {
2148                         report.Error (1535, loc, "Overloaded unary operator `explicit' takes one parameter");
2149                 }
2150
2151                 if (doc_support) {
2152                         tmpComment = Lexer.consume_doc_comment ();
2153                         Lexer.doc_state = XmlCommentState.NotAllowed;
2154                 }
2155
2156                 $$ = new OperatorDeclaration (Operator.OpType.Explicit, (FullNamedExpression) $3, loc);
2157                 lbag.AddLocation ($$, GetLocation ($1), GetLocation ($2), GetLocation ($4), GetLocation ($7));
2158           }
2159         | IMPLICIT error
2160           {
2161                 Error_SyntaxError (yyToken);
2162                 current_local_parameters = ParametersCompiled.EmptyReadOnlyParameters;
2163                 $$ = new OperatorDeclaration (Operator.OpType.Implicit, null, GetLocation ($1));
2164           }
2165         | EXPLICIT error
2166           {
2167                 Error_SyntaxError (yyToken);
2168                 current_local_parameters = ParametersCompiled.EmptyReadOnlyParameters;
2169                 $$ = new OperatorDeclaration (Operator.OpType.Explicit, null, GetLocation ($1));
2170           }
2171         ;
2172
2173 constructor_declaration
2174         : constructor_declarator
2175           constructor_body
2176           {
2177                 Constructor c = (Constructor) $1;
2178                 c.Block = (ToplevelBlock) $2;
2179
2180                 if (doc_support)
2181                         c.DocComment = ConsumeStoredComment ();
2182
2183                 current_local_parameters = null;
2184                 if (doc_support)
2185                         Lexer.doc_state = XmlCommentState.Allowed;
2186           }
2187         ;
2188
2189 constructor_declarator
2190         : opt_attributes
2191           opt_modifiers
2192           IDENTIFIER
2193           {
2194                 if (doc_support) {
2195                         tmpComment = Lexer.consume_doc_comment ();
2196                         Lexer.doc_state = XmlCommentState.Allowed;
2197                 }
2198
2199                 valid_param_mod = ParameterModifierType.All;
2200           }
2201           OPEN_PARENS opt_formal_parameter_list CLOSE_PARENS
2202           {
2203                 valid_param_mod = 0;
2204                 current_local_parameters = (ParametersCompiled) $6;
2205
2206                 var lt = (Tokenizer.LocatedToken) $3;
2207                 var mods = (Modifiers) $2;
2208                 var c = new Constructor (current_type, lt.Value, mods, (Attributes) $1, current_local_parameters, lt.Location);
2209
2210                 if (lt.Value != current_container.MemberName.Name) {
2211                         report.Error (1520, c.Location, "Class, struct, or interface method must have a return type");
2212                 } else if ((mods & Modifiers.STATIC) != 0) {
2213                         if ((mods & Modifiers.AccessibilityMask) != 0){
2214                                 report.Error (515, c.Location,
2215                                         "`{0}': static constructor cannot have an access modifier",
2216                                         c.GetSignatureForError ());
2217                         }
2218                 }
2219
2220                 current_type.AddConstructor (c);
2221                 lbag.AddMember (c, mod_locations, GetLocation ($5), GetLocation ($7));
2222                 $$ = c;
2223
2224                 //
2225                 // start block here, so possible anonymous methods inside
2226                 // constructor initializer can get correct parent block
2227                 //
2228                 start_block (lexer.Location);
2229           }
2230           opt_constructor_initializer
2231           {
2232                 if ($9 != null) {
2233                         var c = (Constructor) $8;
2234                         c.Initializer = (ConstructorInitializer) $9;
2235
2236                         if (c.IsStatic) {
2237                                 report.Error (514, c.Location,
2238                                         "`{0}': static constructor cannot have an explicit `this' or `base' constructor call",
2239                                         c.GetSignatureForError ());
2240                         }
2241                 }
2242
2243                 $$ = $8;
2244           }
2245         ;
2246
2247 constructor_body
2248         : block_prepared
2249         | SEMICOLON             { current_block = null; $$ = null; }
2250         ;
2251
2252 opt_constructor_initializer
2253         : /* Empty */
2254         | constructor_initializer
2255         ;
2256
2257 constructor_initializer
2258         : COLON BASE OPEN_PARENS
2259           {
2260                 ++lexer.parsing_block;
2261           }
2262           opt_argument_list CLOSE_PARENS
2263           {
2264                 --lexer.parsing_block;
2265                 $$ = new ConstructorBaseInitializer ((Arguments) $5, GetLocation ($2));
2266                 lbag.AddLocation ($$, GetLocation ($1), GetLocation ($3), GetLocation ($6));
2267           }
2268         | COLON THIS OPEN_PARENS
2269           {
2270                 ++lexer.parsing_block;
2271           }
2272           opt_argument_list CLOSE_PARENS
2273           {
2274                 --lexer.parsing_block;
2275                 $$ = new ConstructorThisInitializer ((Arguments) $5, GetLocation ($2));
2276                 lbag.AddLocation ($$, GetLocation ($1), GetLocation ($3), GetLocation ($6));
2277           }
2278         | COLON error
2279           {
2280                 Error_SyntaxError (yyToken);
2281                 $$ = new ConstructorThisInitializer (null, GetLocation ($2));
2282                 lbag.AddLocation ($$, GetLocation ($1));
2283           }
2284         | error
2285           {
2286                 Error_SyntaxError (yyToken);
2287                 $$ = null;
2288           }
2289         ;
2290
2291 destructor_declaration
2292         : opt_attributes opt_modifiers TILDE
2293           {
2294                 if (doc_support) {
2295                         tmpComment = Lexer.consume_doc_comment ();
2296                         Lexer.doc_state = XmlCommentState.NotAllowed;
2297                 }
2298
2299                 current_local_parameters = ParametersCompiled.EmptyReadOnlyParameters;
2300           }
2301           IDENTIFIER OPEN_PARENS CLOSE_PARENS method_body
2302           {
2303                 var lt = (Tokenizer.LocatedToken) $5;
2304                 if (lt.Value != current_container.MemberName.Name){
2305                         report.Error (574, lt.Location, "Name of destructor must match name of class");
2306                 } else if (current_container.Kind != MemberKind.Class){
2307                         report.Error (575, lt.Location, "Only class types can contain destructor");
2308                 }
2309
2310                 Destructor d = new Destructor (current_type, (Modifiers) $2,
2311                         ParametersCompiled.EmptyReadOnlyParameters, (Attributes) $1, lt.Location);
2312                 if (doc_support)
2313                         d.DocComment = ConsumeStoredComment ();
2314
2315                 d.Block = (ToplevelBlock) $8;
2316                 current_type.AddMember (d);
2317                 lbag.AddMember (d, mod_locations, GetLocation ($3), GetLocation ($6), GetLocation ($7));
2318
2319                 current_local_parameters = null;
2320           }
2321         ;
2322
2323 event_declaration
2324         : opt_attributes
2325           opt_modifiers
2326           EVENT type member_declaration_name
2327           {
2328                 current_event_field = new EventField (current_type, (FullNamedExpression) $4, (Modifiers) $2, (MemberName) $5, (Attributes) $1);
2329                 current_type.AddMember (current_event_field);
2330
2331                 if (current_event_field.MemberName.ExplicitInterface != null) {
2332                         report.Error (71, current_event_field.Location, "`{0}': An explicit interface implementation of an event must use property syntax",
2333                         current_event_field.GetSignatureForError ());
2334                 }
2335
2336                 $$ = current_event_field;
2337           }
2338           opt_event_initializer
2339           opt_event_declarators
2340           SEMICOLON
2341           {
2342                 if (doc_support) {
2343                         current_event_field.DocComment = Lexer.consume_doc_comment ();
2344                         Lexer.doc_state = XmlCommentState.Allowed;
2345                 }
2346
2347                 lbag.AddMember (current_event_field, mod_locations, GetLocation ($3), GetLocation ($9));
2348                 current_event_field = null;
2349           }
2350         | opt_attributes
2351           opt_modifiers
2352           EVENT type member_declaration_name
2353           OPEN_BRACE
2354           {
2355                 current_event = new EventProperty (current_type, (FullNamedExpression) $4, (Modifiers) $2, (MemberName) $5, (Attributes) $1);
2356                 current_type.AddMember (current_event);
2357                 lbag.AddMember (current_event, mod_locations, GetLocation ($3), GetLocation ($6));
2358
2359                 lexer.EventParsing = true;
2360           }
2361           event_accessor_declarations
2362           {
2363                 if (current_container.Kind == MemberKind.Interface)
2364                         report.Error (69, GetLocation ($6), "Event in interface cannot have add or remove accessors");
2365
2366                 lexer.EventParsing = false;
2367           }
2368           CLOSE_BRACE
2369           {
2370                 if (doc_support) {
2371                         current_event.DocComment = Lexer.consume_doc_comment ();
2372                         Lexer.doc_state = XmlCommentState.Allowed;
2373                 }
2374
2375                 lbag.AppendToMember (current_event, GetLocation ($9));
2376                 current_event = null;
2377                 current_local_parameters = null;
2378           }
2379         | opt_attributes
2380           opt_modifiers
2381           EVENT type error
2382           {
2383                 Error_SyntaxError (yyToken);
2384
2385                 current_type.AddMember (new EventField (current_type, (FullNamedExpression) $4, (Modifiers) $2, MemberName.Null, (Attributes) $1));
2386           }
2387         ;
2388
2389 opt_event_initializer
2390         : /* empty */
2391         | ASSIGN
2392           {
2393                 ++lexer.parsing_block;
2394           }
2395           event_variable_initializer
2396           {
2397                 --lexer.parsing_block;
2398                 current_event_field.Initializer = (Expression) $3;
2399           }
2400         ;
2401
2402 opt_event_declarators
2403         : /* empty */
2404         | event_declarators
2405         ;
2406
2407 event_declarators
2408         : event_declarator
2409           {
2410                 current_event_field.AddDeclarator ((FieldDeclarator) $1);
2411           }
2412         | event_declarators event_declarator
2413           {
2414                 current_event_field.AddDeclarator ((FieldDeclarator) $2);
2415           }
2416         ;
2417
2418 event_declarator
2419         : COMMA IDENTIFIER
2420           {
2421                 var lt = (Tokenizer.LocatedToken) $2;
2422                 $$ = new FieldDeclarator (new SimpleMemberName (lt.Value, lt.Location), null);
2423                 lbag.AddLocation ($$, GetLocation ($1));
2424           }
2425         | COMMA IDENTIFIER ASSIGN
2426           {
2427                 ++lexer.parsing_block;
2428           }
2429           event_variable_initializer
2430           {
2431                 --lexer.parsing_block;
2432                 var lt = (Tokenizer.LocatedToken) $2;
2433                 $$ = new FieldDeclarator (new SimpleMemberName (lt.Value, lt.Location), (Expression) $5);
2434                 lbag.AddLocation ($$, GetLocation ($1), GetLocation ($3));
2435           }
2436         ;
2437
2438 event_variable_initializer
2439         : {
2440                 if (current_container.Kind == MemberKind.Interface) {
2441                         report.Error (68, lexer.Location, "`{0}': event in interface cannot have an initializer",
2442                                 current_event_field.GetSignatureForError ());
2443                 }
2444
2445                 if ((current_event_field.ModFlags & Modifiers.ABSTRACT) != 0) {
2446                         report.Error (74, lexer.Location, "`{0}': abstract event cannot have an initializer",
2447                                 current_event_field.GetSignatureForError ());
2448                 }
2449           }
2450           variable_initializer
2451           {
2452                 $$ = $2;
2453           }
2454         ;
2455
2456 event_accessor_declarations
2457         : add_accessor_declaration remove_accessor_declaration
2458         | remove_accessor_declaration add_accessor_declaration
2459         | add_accessor_declaration
2460           {
2461                 report.Error (65, lexer.Location, "`{0}': event property must have both add and remove accessors",
2462                         current_event.GetSignatureForError ());
2463           }
2464         | remove_accessor_declaration
2465           {
2466                 report.Error (65, lexer.Location, "`{0}': event property must have both add and remove accessors",
2467                         current_event.GetSignatureForError ());
2468           }
2469         | error
2470           {
2471                 report.Error (1055, GetLocation ($1), "An add or remove accessor expected");
2472                 $$ = null;
2473           }
2474         ;
2475
2476 add_accessor_declaration
2477         : opt_attributes opt_modifiers ADD
2478           {
2479                 if ($2 != ModifierNone) {
2480                         report.Error (1609, GetLocation ($2), "Modifiers cannot be placed on event accessor declarations");
2481                 }
2482
2483                 current_event.Add = new EventProperty.AddDelegateMethod (current_event, (Attributes) $1, GetLocation ($3));
2484                 current_local_parameters = current_event.Add.ParameterInfo;
2485
2486                 lbag.AddMember (current_event.Add, mod_locations);
2487                 lexer.EventParsing = false;
2488           }
2489           event_accessor_block
2490           {
2491                 lexer.EventParsing = true;
2492
2493                 current_event.Add.Block = (ToplevelBlock) $5;
2494
2495                 if (current_container.Kind == MemberKind.Interface) {
2496                         report.Error (531, current_event.Add.Block.StartLocation,
2497                                 "`{0}': interface members cannot have a definition", current_event.Add.GetSignatureForError ());
2498                 }
2499
2500                 current_local_parameters = null;
2501           }
2502         ;
2503
2504 remove_accessor_declaration
2505         : opt_attributes opt_modifiers REMOVE
2506           {
2507                 if ($2 != ModifierNone) {
2508                         report.Error (1609, GetLocation ($2), "Modifiers cannot be placed on event accessor declarations");
2509                 }
2510
2511                 current_event.Remove = new EventProperty.RemoveDelegateMethod (current_event, (Attributes) $1, GetLocation ($3));
2512                 current_local_parameters = current_event.Remove.ParameterInfo;
2513
2514                 lbag.AddMember (current_event.Remove, mod_locations);
2515                 lexer.EventParsing = false;
2516           }
2517           event_accessor_block
2518           {
2519                 lexer.EventParsing = true;
2520
2521                 current_event.Remove.Block = (ToplevelBlock) $5;
2522
2523                 if (current_container.Kind == MemberKind.Interface) {
2524                         report.Error (531, current_event.Remove.Block.StartLocation,
2525                                 "`{0}': interface members cannot have a definition", current_event.Remove.GetSignatureForError ());
2526                 }
2527
2528                 current_local_parameters = null;
2529           }
2530         ;
2531
2532 event_accessor_block
2533         : opt_semicolon
2534           {
2535                 report.Error (73, lexer.Location, "An add or remove accessor must have a body");
2536                 $$ = null;
2537           }
2538         | block;
2539         ;
2540
2541 attributes_without_members
2542         : attribute_sections CLOSE_BRACE
2543           {
2544                 current_type.UnattachedAttributes = (Attributes) $1;
2545                 report.Error (1519, GetLocation ($1), "An attribute is missing member declaration");
2546                 lexer.putback ('}');
2547           }
2548         ;
2549
2550 // For full ast try to recover incomplete ambiguous member
2551 // declaration in form on class X { public int }
2552 incomplete_member
2553         : opt_attributes opt_modifiers member_type CLOSE_BRACE
2554           {
2555                 report.Error (1519, lexer.Location, "Unexpected symbol `}' in class, struct, or interface member declaration");
2556
2557                 lexer.putback ('}');
2558
2559                 lexer.parsing_generic_declaration = false;
2560                 FullNamedExpression type = (FullNamedExpression) $3;
2561                 current_field = new Field (current_type, type, (Modifiers) $2, MemberName.Null, (Attributes) $1);
2562                 current_type.AddField (current_field);
2563                 $$ = current_field;
2564           }
2565         ;
2566
2567 enum_declaration
2568         : opt_attributes
2569           opt_modifiers
2570           ENUM type_declaration_name
2571           opt_enum_base
2572           {
2573                 if (doc_support)
2574                         enumTypeComment = Lexer.consume_doc_comment ();
2575           }
2576           OPEN_BRACE
2577           {
2578                 if (doc_support)
2579                         Lexer.doc_state = XmlCommentState.Allowed;
2580
2581                 MemberName name = (MemberName) $4;
2582                 if (name.IsGeneric) {
2583                         report.Error (1675, name.Location, "Enums cannot have type parameters");
2584                 }
2585
2586                 push_current_container (new Enum (current_container, (FullNamedExpression) $5, (Modifiers) $2, name, (Attributes) $1), null);
2587           }
2588           opt_enum_member_declarations
2589           {
2590                 // here will be evaluated after CLOSE_BLACE is consumed.
2591                 if (doc_support)
2592                         Lexer.doc_state = XmlCommentState.Allowed;
2593           }
2594           CLOSE_BRACE opt_semicolon
2595           {
2596                 if (doc_support)
2597                         current_container.DocComment = enumTypeComment;
2598
2599                 --lexer.parsing_declaration;
2600
2601 //                      if (doc_support)
2602 //                              em.DocComment = ev.DocComment;
2603
2604                 lbag.AddMember (current_container, mod_locations, GetLocation ($3), GetLocation ($7), GetLocation ($11));
2605                 $$ = pop_current_class ();
2606           }
2607         ;
2608
2609 opt_enum_base
2610         : /* empty */
2611         | COLON type
2612          {
2613                 var te = $2 as TypeExpression;
2614                 if (te == null || !EnumSpec.IsValidUnderlyingType (te.Type)) {
2615                         Enum.Error_1008 (GetLocation ($2), report);
2616                 }
2617                 $$ = $2;
2618          }
2619         | COLON error
2620          {
2621                 Error_TypeExpected (GetLocation ($1));
2622                 $$ = null;
2623          }
2624         ;
2625
2626 opt_enum_member_declarations
2627         : /* empty */
2628         | enum_member_declarations
2629         | enum_member_declarations COMMA
2630           {
2631                 lbag.AddLocation ($1, GetLocation ($2));
2632           }
2633         ;
2634
2635 enum_member_declarations
2636         : enum_member_declaration
2637         | enum_member_declarations COMMA enum_member_declaration
2638           {
2639                 lbag.AddLocation ($1, GetLocation ($2));
2640                 $$ = $3;
2641           }
2642         ;
2643
2644 enum_member_declaration
2645         : opt_attributes IDENTIFIER
2646           {
2647                 var lt = (Tokenizer.LocatedToken) $2;
2648                 var em = new EnumMember ((Enum) current_type, new MemberName (lt.Value, lt.Location), (Attributes) $1);
2649                 ((Enum) current_type).AddEnumMember (em);
2650
2651                 if (doc_support) {
2652                         em.DocComment = Lexer.consume_doc_comment ();
2653                         Lexer.doc_state = XmlCommentState.Allowed;
2654                 }
2655
2656                 $$ = em;
2657           }
2658         | opt_attributes IDENTIFIER
2659           {
2660                 ++lexer.parsing_block;
2661                 if (doc_support) {
2662                         tmpComment = Lexer.consume_doc_comment ();
2663                         Lexer.doc_state = XmlCommentState.NotAllowed;
2664                 }
2665           }
2666           ASSIGN constant_expression
2667           {
2668                 --lexer.parsing_block;
2669
2670                 var lt = (Tokenizer.LocatedToken) $2;
2671                 var em = new EnumMember ((Enum) current_type, new MemberName (lt.Value, lt.Location), (Attributes) $1);
2672                 em.Initializer = new ConstInitializer (em, (Expression) $5, GetLocation ($4));
2673                 ((Enum) current_type).AddEnumMember (em);
2674
2675                 if (doc_support)
2676                         em.DocComment = ConsumeStoredComment ();
2677
2678                 $$ = em;
2679           }
2680         | opt_attributes IDENTIFIER error
2681           {
2682                 Error_SyntaxError (yyToken);
2683
2684                 var lt = (Tokenizer.LocatedToken) $2;
2685                 var em = new EnumMember ((Enum) current_type, new MemberName (lt.Value, lt.Location), (Attributes) $1);
2686                 ((Enum) current_type).AddEnumMember (em);
2687
2688                 if (doc_support) {
2689                         em.DocComment = Lexer.consume_doc_comment ();
2690                         Lexer.doc_state = XmlCommentState.Allowed;
2691                 }
2692
2693                 $$ = em;
2694           }
2695         | attributes_without_members
2696         ;
2697
2698 delegate_declaration
2699         : opt_attributes
2700           opt_modifiers
2701           DELEGATE
2702           member_type type_declaration_name
2703           OPEN_PARENS
2704           {
2705                 valid_param_mod = ParameterModifierType.Ref | ParameterModifierType.Out | ParameterModifierType.Params | ParameterModifierType.DefaultValue;
2706           }
2707           opt_formal_parameter_list CLOSE_PARENS
2708           {
2709                 valid_param_mod = 0;
2710
2711                 ParametersCompiled p = (ParametersCompiled) $8;
2712
2713                 Delegate del = new Delegate (current_container, (FullNamedExpression) $4, (Modifiers) $2, (MemberName) $5, p, (Attributes) $1);
2714
2715                 p.CheckParameters (del);
2716
2717                 current_container.AddTypeContainer (del);
2718
2719                 current_delegate = del;
2720                 lexer.ConstraintsParsing = true;
2721           }
2722           opt_type_parameter_constraints_clauses
2723           {
2724                 lexer.ConstraintsParsing = false;
2725           }
2726           SEMICOLON
2727           {
2728                 if (doc_support) {
2729                         current_delegate.DocComment = Lexer.consume_doc_comment ();
2730                         Lexer.doc_state = XmlCommentState.Allowed;
2731                 }
2732
2733                 if ($11 != null)
2734                         current_delegate.SetConstraints ((List<Constraints>) $11);
2735                 lbag.AddMember (current_delegate, mod_locations, GetLocation ($3), GetLocation ($6), GetLocation ($9), GetLocation ($13));
2736
2737                 $$ = current_delegate;
2738
2739                 current_delegate = null;
2740           }
2741         ;
2742
2743 opt_nullable
2744         : /* empty */
2745         | INTERR_NULLABLE
2746           {
2747                 if (lang_version < LanguageVersion.ISO_2)
2748                         FeatureIsNotAvailable (GetLocation ($1), "nullable types");
2749
2750                 $$ = ComposedTypeSpecifier.CreateNullable (GetLocation ($1));
2751           }
2752         ;
2753
2754 namespace_or_type_expr
2755         : member_name
2756         | qualified_alias_member IDENTIFIER opt_type_argument_list
2757           {
2758                 var lt1 = (Tokenizer.LocatedToken) $1;
2759                 var lt2 = (Tokenizer.LocatedToken) $2;
2760
2761                 $$ = new QualifiedAliasMember (lt1.Value, lt2.Value, (TypeArguments) $3, lt1.Location);
2762                 lbag.AddLocation ($$, GetLocation ($2));
2763           }
2764         ;
2765
2766 member_name
2767         : simple_name_expr
2768         | namespace_or_type_expr DOT IDENTIFIER opt_type_argument_list
2769           {
2770                 var lt = (Tokenizer.LocatedToken) $3;
2771                 $$ = new MemberAccess ((Expression) $1, lt.Value, (TypeArguments) $4, lt.Location);
2772                 lbag.AddLocation ($$, GetLocation ($2));
2773           }
2774         ;
2775
2776 simple_name_expr
2777         : IDENTIFIER opt_type_argument_list
2778           {
2779                 var lt = (Tokenizer.LocatedToken) $1;
2780                 $$ = new SimpleName (lt.Value, (TypeArguments)$2, lt.Location);
2781           }
2782         ;
2783
2784 //
2785 // Generics arguments  (any type, without attributes)
2786 //
2787 opt_type_argument_list
2788         : /* empty */
2789         | OP_GENERICS_LT type_arguments OP_GENERICS_GT
2790           {
2791                 if (lang_version < LanguageVersion.ISO_2)
2792                         FeatureIsNotAvailable (GetLocation ($1), "generics");
2793
2794                 $$ = $2;
2795           }
2796         | OP_GENERICS_LT error
2797           {
2798                 Error_TypeExpected (lexer.Location);
2799                 $$ = new TypeArguments ();
2800           }
2801         ;
2802
2803 type_arguments
2804         : type
2805           {
2806                 TypeArguments type_args = new TypeArguments ();
2807                 type_args.Add ((FullNamedExpression) $1);
2808                 $$ = type_args;
2809           }
2810         | type_arguments COMMA type
2811           {
2812                 TypeArguments type_args = (TypeArguments) $1;
2813                 type_args.Add ((FullNamedExpression) $3);
2814                 $$ = type_args;
2815           }
2816         ;
2817
2818 //
2819 // Generics parameters (identifiers only, with attributes), used in type or method declarations
2820 //
2821 type_declaration_name
2822         : IDENTIFIER
2823           {
2824                 lexer.parsing_generic_declaration = true;
2825           }
2826           opt_type_parameter_list
2827           {
2828                 lexer.parsing_generic_declaration = false;
2829                 var lt = (Tokenizer.LocatedToken) $1;
2830                 $$ = new MemberName (lt.Value, (TypeParameters)$3, lt.Location);
2831           }
2832         ;
2833
2834 member_declaration_name
2835         : method_declaration_name
2836           {
2837                 MemberName mn = (MemberName)$1;
2838                 if (mn.TypeParameters != null)
2839                         syntax_error (mn.Location, string.Format ("Member `{0}' cannot declare type arguments",
2840                                 mn.GetSignatureForError ()));
2841           }
2842         ;
2843
2844 method_declaration_name
2845         : type_declaration_name
2846         | explicit_interface IDENTIFIER opt_type_parameter_list
2847           {
2848                 lexer.parsing_generic_declaration = false;
2849                 var lt = (Tokenizer.LocatedToken) $2;
2850                 $$ = new MemberName (lt.Value, (TypeParameters) $3, (ATypeNameExpression) $1, lt.Location);
2851           }
2852         ;
2853
2854 indexer_declaration_name
2855         : THIS
2856           {
2857                 lexer.parsing_generic_declaration = false;
2858                 $$ = new MemberName (TypeDefinition.DefaultIndexerName, GetLocation ($1));
2859           }
2860         | explicit_interface THIS
2861           {
2862                 lexer.parsing_generic_declaration = false;
2863                 $$ = new MemberName (TypeDefinition.DefaultIndexerName, null, (ATypeNameExpression) $1, GetLocation ($2));
2864           }
2865         ;
2866
2867 explicit_interface
2868         : IDENTIFIER opt_type_argument_list DOT
2869           {
2870                 var lt = (Tokenizer.LocatedToken) $1;
2871                 $$ = new SimpleName (lt.Value, (TypeArguments) $2, lt.Location);
2872                 lbag.AddLocation ($$, GetLocation ($3));
2873           }
2874         | qualified_alias_member IDENTIFIER opt_type_argument_list DOT
2875           {
2876                 var lt1 = (Tokenizer.LocatedToken) $1;
2877                 var lt2 = (Tokenizer.LocatedToken) $2;
2878
2879                 $$ = new QualifiedAliasMember (lt1.Value, lt2.Value, (TypeArguments) $3, lt1.Location);
2880                 lbag.AddLocation ($$, GetLocation ($4));
2881           }
2882         | explicit_interface IDENTIFIER opt_type_argument_list DOT
2883           {
2884                 var lt = (Tokenizer.LocatedToken) $2;
2885                 $$ = new MemberAccess ((ATypeNameExpression) $1, lt.Value, (TypeArguments) $3, lt.Location);
2886                 lbag.AddLocation ($$, GetLocation ($4));
2887           }
2888         ;
2889
2890 opt_type_parameter_list
2891         : /* empty */
2892         | OP_GENERICS_LT_DECL type_parameters OP_GENERICS_GT
2893           {
2894                 if (lang_version < LanguageVersion.ISO_2)
2895                         FeatureIsNotAvailable (GetLocation ($1), "generics");
2896
2897                 $$ = $2;
2898                 lbag.AddLocation ($$, GetLocation ($1), GetLocation ($3));
2899           }
2900         ;
2901
2902 type_parameters
2903         : type_parameter
2904           {
2905                 var tparams = new TypeParameters ();
2906                 tparams.Add ((TypeParameter)$1);
2907                 $$ = tparams;
2908           }
2909         | type_parameters COMMA type_parameter
2910           {
2911                 var tparams = (TypeParameters) $1;
2912                 tparams.Add ((TypeParameter)$3);
2913                 $$ = tparams;
2914                 lbag.AddLocation ($3, GetLocation ($3));
2915           }
2916         ;
2917
2918 type_parameter
2919         : opt_attributes opt_type_parameter_variance IDENTIFIER
2920           {
2921                 var lt = (Tokenizer.LocatedToken)$3;
2922                 $$ = new TypeParameter (new MemberName (lt.Value, lt.Location), (Attributes)$1, (Variance) $2);
2923           }
2924         | error
2925           {
2926                 if (GetTokenName (yyToken) == "type")
2927                         report.Error (81, GetLocation ($1), "Type parameter declaration must be an identifier not a type");
2928                 else
2929                         Error_SyntaxError (yyToken);
2930
2931                 $$ = new TypeParameter (MemberName.Null, null, Variance.None);
2932           }
2933         ;
2934
2935 //
2936 // All types where void is allowed
2937 //
2938 type_and_void
2939         : type_expression_or_array
2940         | VOID
2941           {
2942                 $$ = new TypeExpression (compiler.BuiltinTypes.Void, GetLocation ($1));
2943           }
2944         ;
2945
2946 member_type
2947         : type_and_void
2948           {
2949                 lexer.parsing_generic_declaration = true;
2950           }
2951         ;
2952
2953 //
2954 // A type which does not allow `void' to be used
2955 //
2956 type
2957         : type_expression_or_array
2958         | VOID
2959           {
2960                 Expression.Error_VoidInvalidInTheContext (GetLocation ($1), report);
2961                 $$ = new TypeExpression (compiler.BuiltinTypes.Void, GetLocation ($1));
2962           }
2963         ;
2964
2965 simple_type
2966         : type_expression
2967         | VOID
2968           {
2969                 Expression.Error_VoidInvalidInTheContext (GetLocation ($1), report);
2970                 $$ = new TypeExpression (compiler.BuiltinTypes.Void, GetLocation ($1));
2971           }
2972         ;
2973
2974 parameter_type
2975         : type_expression_or_array
2976         | VOID
2977           {
2978                 report.Error (1536, GetLocation ($1), "Invalid parameter type `void'");
2979                 $$ = new TypeExpression (compiler.BuiltinTypes.Void, GetLocation ($1));
2980           }
2981         ;
2982
2983 type_expression_or_array
2984         : type_expression
2985         | type_expression rank_specifiers
2986           {
2987                 $$ = new ComposedCast ((FullNamedExpression) $1, (ComposedTypeSpecifier) $2);
2988           }
2989         ;
2990
2991 type_expression
2992         : namespace_or_type_expr opt_nullable
2993           {
2994                 if ($2 != null) {
2995                         $$ = new ComposedCast ((ATypeNameExpression) $1, (ComposedTypeSpecifier) $2);
2996                 } else {
2997                         var sn = $1 as SimpleName;
2998                         if (sn != null && sn.Name == "var")
2999                                 $$ = new VarExpr (sn.Location);
3000                         else
3001                                 $$ = $1;
3002                 }
3003           }
3004         | namespace_or_type_expr pointer_stars
3005           {
3006                 $$ = new ComposedCast ((ATypeNameExpression) $1, (ComposedTypeSpecifier) $2);
3007           }
3008         | builtin_types opt_nullable
3009           {
3010                 if ($2 != null)
3011                         $$ = new ComposedCast ((FullNamedExpression) $1, (ComposedTypeSpecifier) $2);
3012           }
3013         | builtin_types pointer_stars
3014           {
3015                 $$ = new ComposedCast ((FullNamedExpression) $1, (ComposedTypeSpecifier) $2);
3016           }
3017         | VOID pointer_stars
3018           {
3019                 $$ = new ComposedCast (new TypeExpression (compiler.BuiltinTypes.Void, GetLocation ($1)), (ComposedTypeSpecifier) $2);
3020           }
3021         ;
3022
3023 type_list
3024         : base_type_name
3025           {
3026                 var types = new List<FullNamedExpression> (2);
3027                 types.Add ((FullNamedExpression) $1);
3028                 $$ = types;
3029           }
3030         | type_list COMMA base_type_name
3031           {
3032                 var types = (List<FullNamedExpression>) $1;
3033                 types.Add ((FullNamedExpression) $3);
3034                 $$ = types;
3035           }
3036         ;
3037
3038 base_type_name
3039         : type
3040           {
3041                 if ($1 is ComposedCast) {
3042                         report.Error (1521, GetLocation ($1), "Invalid base type `{0}'", ((ComposedCast)$1).GetSignatureForError ());
3043                 }
3044                 $$ = $1;
3045           }
3046         ;
3047
3048 /*
3049  * replaces all the productions for isolating the various
3050  * simple types, but we need this to reuse it easily in variable_type
3051  */
3052 builtin_types
3053         : OBJECT        { $$ = new TypeExpression (compiler.BuiltinTypes.Object, GetLocation ($1)); }
3054         | STRING        { $$ = new TypeExpression (compiler.BuiltinTypes.String, GetLocation ($1)); }
3055         | BOOL          { $$ = new TypeExpression (compiler.BuiltinTypes.Bool, GetLocation ($1)); }
3056         | DECIMAL       { $$ = new TypeExpression (compiler.BuiltinTypes.Decimal, GetLocation ($1)); }
3057         | FLOAT         { $$ = new TypeExpression (compiler.BuiltinTypes.Float, GetLocation ($1)); }
3058         | DOUBLE        { $$ = new TypeExpression (compiler.BuiltinTypes.Double, GetLocation ($1)); }
3059         | integral_type
3060         ;
3061
3062 integral_type
3063         : SBYTE         { $$ = new TypeExpression (compiler.BuiltinTypes.SByte, GetLocation ($1)); }
3064         | BYTE          { $$ = new TypeExpression (compiler.BuiltinTypes.Byte, GetLocation ($1)); }
3065         | SHORT         { $$ = new TypeExpression (compiler.BuiltinTypes.Short, GetLocation ($1)); }
3066         | USHORT        { $$ = new TypeExpression (compiler.BuiltinTypes.UShort, GetLocation ($1)); }
3067         | INT           { $$ = new TypeExpression (compiler.BuiltinTypes.Int, GetLocation ($1)); }
3068         | UINT          { $$ = new TypeExpression (compiler.BuiltinTypes.UInt, GetLocation ($1)); }
3069         | LONG          { $$ = new TypeExpression (compiler.BuiltinTypes.Long, GetLocation ($1)); }
3070         | ULONG         { $$ = new TypeExpression (compiler.BuiltinTypes.ULong, GetLocation ($1)); }
3071         | CHAR          { $$ = new TypeExpression (compiler.BuiltinTypes.Char, GetLocation ($1)); }
3072         ;
3073
3074 //
3075 // Expressions, section 7.5
3076 //
3077
3078
3079 primary_expression
3080         : primary_expression_or_type
3081         | literal
3082         | array_creation_expression
3083         | parenthesized_expression
3084         | default_value_expression
3085         | invocation_expression
3086         | element_access
3087         | this_access
3088         | base_access
3089         | post_increment_expression
3090         | post_decrement_expression
3091         | object_or_delegate_creation_expression
3092         | anonymous_type_expression
3093         | typeof_expression
3094         | sizeof_expression
3095         | checked_expression
3096         | unchecked_expression
3097         | pointer_member_access
3098         | anonymous_method_expression
3099         | undocumented_expressions
3100         ;
3101
3102 primary_expression_or_type
3103         : IDENTIFIER opt_type_argument_list
3104           {
3105                 var lt = (Tokenizer.LocatedToken) $1;
3106                 $$ = new SimpleName (lt.Value, (TypeArguments)$2, lt.Location);
3107           }
3108         | IDENTIFIER GENERATE_COMPLETION {
3109                 var lt = (Tokenizer.LocatedToken) $1;
3110                $$ = new CompletionSimpleName (MemberName.MakeName (lt.Value, null), lt.Location);
3111           }
3112         | member_access
3113         ;
3114
3115 literal
3116         : boolean_literal
3117         | LITERAL
3118         | NULL                  { $$ = new NullLiteral (GetLocation ($1)); }
3119         ;
3120
3121 boolean_literal
3122         : TRUE                  { $$ = new BoolLiteral (compiler.BuiltinTypes, true, GetLocation ($1)); }
3123         | FALSE                 { $$ = new BoolLiteral (compiler.BuiltinTypes, false, GetLocation ($1)); }
3124         ;
3125
3126
3127 //
3128 // Here is the trick, tokenizer may think that parens is a special but
3129 // parser is interested in open parens only, so we merge them.
3130 // Consider: if (a)foo ();
3131 //
3132 open_parens_any
3133         : OPEN_PARENS
3134         | OPEN_PARENS_CAST
3135         ;
3136
3137 //
3138 // Use this production to accept closing parenthesis or
3139 // performing completion
3140 //
3141 close_parens
3142         : CLOSE_PARENS
3143         | COMPLETE_COMPLETION
3144         ;
3145
3146
3147 parenthesized_expression
3148         : OPEN_PARENS expression CLOSE_PARENS
3149           {
3150                 $$ = new ParenthesizedExpression ((Expression) $2, GetLocation ($1));
3151                 lbag.AddLocation ($$, GetLocation ($1), GetLocation ($3));
3152           }
3153         | OPEN_PARENS expression COMPLETE_COMPLETION
3154           {
3155                 $$ = new ParenthesizedExpression ((Expression) $2, GetLocation ($1));
3156           }
3157         ;
3158
3159 member_access
3160         : primary_expression DOT identifier_inside_body opt_type_argument_list
3161           {
3162                 var lt = (Tokenizer.LocatedToken) $3;
3163                 $$ = new MemberAccess ((Expression) $1, lt.Value, (TypeArguments) $4, lt.Location);
3164                 lbag.AddLocation ($$, GetLocation ($2));
3165           }
3166         | builtin_types DOT identifier_inside_body opt_type_argument_list
3167           {
3168                 var lt = (Tokenizer.LocatedToken) $3;
3169                 $$ = new MemberAccess ((Expression) $1, lt.Value, (TypeArguments) $4, lt.Location);
3170                 lbag.AddLocation ($$, GetLocation ($2));
3171           }
3172         | BASE DOT identifier_inside_body opt_type_argument_list
3173           {
3174                 var lt = (Tokenizer.LocatedToken) $3;
3175                 $$ = new MemberAccess (new BaseThis (GetLocation ($1)), lt.Value, (TypeArguments) $4, lt.Location);
3176                 lbag.AddLocation ($$, GetLocation ($2));
3177           }
3178         | qualified_alias_member identifier_inside_body opt_type_argument_list
3179           {
3180                 var lt1 = (Tokenizer.LocatedToken) $1;
3181                 var lt2 = (Tokenizer.LocatedToken) $2;
3182
3183                 $$ = new QualifiedAliasMember (lt1.Value, lt2.Value, (TypeArguments) $3, lt1.Location);
3184                 lbag.AddLocation ($$, GetLocation ($2));
3185           }
3186         | primary_expression DOT GENERATE_COMPLETION {
3187                 $$ = new CompletionMemberAccess ((Expression) $1, null,GetLocation ($3));
3188           }
3189         | primary_expression DOT IDENTIFIER GENERATE_COMPLETION {
3190                 var lt = (Tokenizer.LocatedToken) $3;
3191                 $$ = new CompletionMemberAccess ((Expression) $1, lt.Value, lt.Location);
3192           }
3193         | builtin_types DOT GENERATE_COMPLETION
3194           {
3195                 $$ = new CompletionMemberAccess ((Expression) $1, null, lexer.Location);
3196           }
3197         | builtin_types DOT IDENTIFIER GENERATE_COMPLETION {
3198                 var lt = (Tokenizer.LocatedToken) $3;
3199                 $$ = new CompletionMemberAccess ((Expression) $1, lt.Value, lt.Location);
3200           }
3201         ;
3202
3203 invocation_expression
3204         : primary_expression open_parens_any opt_argument_list close_parens
3205           {
3206                 $$ = new Invocation ((Expression) $1, (Arguments) $3);
3207                 lbag.AddLocation ($$, GetLocation ($2), GetLocation ($4));
3208           }
3209         | primary_expression open_parens_any argument_list error
3210           {
3211                 Error_SyntaxError (yyToken);
3212
3213                 $$ = new Invocation ((Expression) $1, (Arguments) $3);
3214                 lbag.AddLocation ($$, GetLocation ($2));
3215           }
3216         | primary_expression open_parens_any error
3217           {
3218                 Error_SyntaxError (yyToken);
3219
3220                 $$ = new Invocation ((Expression) $1, null);
3221                 lbag.AddLocation ($$, GetLocation ($2));
3222           }
3223         ;
3224
3225 opt_object_or_collection_initializer
3226         : /* empty */           { $$ = null; }
3227         | object_or_collection_initializer
3228         ;
3229
3230 object_or_collection_initializer
3231         : OPEN_BRACE opt_member_initializer_list close_brace_or_complete_completion
3232           {
3233                 if ($2 == null) {
3234                         $$ = new CollectionOrObjectInitializers (GetLocation ($1));
3235                 } else {
3236                         $$ = new CollectionOrObjectInitializers ((List<Expression>) $2, GetLocation ($1));
3237                 }
3238                 lbag.AddLocation ($$, GetLocation ($3));
3239           }
3240         | OPEN_BRACE member_initializer_list COMMA CLOSE_BRACE
3241           {
3242                 $$ = new CollectionOrObjectInitializers ((List<Expression>) $2, GetLocation ($1));
3243                 lbag.AddLocation ($$, GetLocation ($3), GetLocation ($4));
3244           }
3245         ;
3246
3247 opt_member_initializer_list
3248         : /* empty */           { $$ = null; }
3249         | member_initializer_list
3250         {
3251                 $$ = $1;
3252         }
3253         ;
3254
3255 member_initializer_list
3256         : member_initializer
3257           {
3258                 var a = new List<Expression> ();
3259                 a.Add ((Expression) $1);
3260                 $$ = a;
3261           }
3262         | member_initializer_list COMMA member_initializer
3263           {
3264                 var a = (List<Expression>)$1;
3265                 a.Add ((Expression) $3);
3266                 $$ = a;
3267           }
3268         | member_initializer_list error {
3269                 Error_SyntaxError (yyToken);
3270                 $$ = $1;
3271           }
3272         ;
3273
3274 member_initializer
3275         : IDENTIFIER ASSIGN initializer_value
3276           {
3277                 var lt = (Tokenizer.LocatedToken) $1;
3278                 $$ = new ElementInitializer (lt.Value, (Expression)$3, lt.Location);
3279                 lbag.AddLocation ($$, GetLocation ($2));
3280           }
3281         | AWAIT ASSIGN initializer_value
3282           {
3283                 var lt = (Tokenizer.LocatedToken) Error_AwaitAsIdentifier ($1);
3284                 $$ = new ElementInitializer (lt.Value, (Expression)$3, lt.Location);
3285                 lbag.AddLocation ($$, GetLocation ($2));
3286           }
3287         | GENERATE_COMPLETION
3288           {
3289                 $$ = new CompletionElementInitializer (null, GetLocation ($1));
3290           }
3291         | non_assignment_expression opt_COMPLETE_COMPLETION  {
3292                 CompletionSimpleName csn = $1 as CompletionSimpleName;
3293                 if (csn == null)
3294                         $$ = new CollectionElementInitializer ((Expression)$1);
3295                 else
3296                         $$ = new CompletionElementInitializer (csn.Prefix, csn.Location);
3297           }
3298         | OPEN_BRACE expression_list CLOSE_BRACE
3299           {
3300                 if ($2 == null)
3301                         $$ = null;
3302                 else
3303                         $$ = new CollectionElementInitializer ((List<Expression>)$2, GetLocation ($1));
3304           }
3305         | OPEN_BRACE CLOSE_BRACE
3306           {
3307                 report.Error (1920, GetLocation ($1), "An element initializer cannot be empty");
3308                 $$ = null;
3309           }
3310         ;
3311
3312 initializer_value
3313         : expression
3314         | object_or_collection_initializer
3315         ;
3316
3317 opt_argument_list
3318         : /* empty */           { $$ = null; }
3319         | argument_list
3320         ;
3321
3322 argument_list
3323         : argument_or_named_argument
3324           {
3325                 Arguments list = new Arguments (4);
3326                 list.Add ((Argument) $1);
3327                 $$ = list;
3328           }
3329         | argument_list COMMA argument
3330           {
3331                 Arguments list = (Arguments) $1;
3332                 if (list [list.Count - 1] is NamedArgument)
3333                         Error_NamedArgumentExpected ((NamedArgument) list [list.Count - 1]);
3334
3335                 list.Add ((Argument) $3);
3336                 $$ = list;
3337           }
3338         | argument_list COMMA named_argument
3339           {
3340                 Arguments list = (Arguments) $1;
3341                 NamedArgument a = (NamedArgument) $3;
3342                 for (int i = 0; i < list.Count; ++i) {
3343                         NamedArgument na = list [i] as NamedArgument;
3344                         if (na != null && na.Name == a.Name)
3345                                 report.Error (1740, na.Location, "Named argument `{0}' specified multiple times",
3346                                         na.Name);
3347                 }
3348
3349                 list.Add (a);
3350                 $$ = list;
3351           }
3352         | argument_list COMMA error
3353           {
3354                 if (lexer.putback_char == -1)
3355                         lexer.putback (')'); // TODO: Wrong but what can I do
3356                 Error_SyntaxError (yyToken);
3357                 $$ = $1;
3358           }
3359         | COMMA error
3360           {
3361                 report.Error (839, GetLocation ($1), "An argument is missing");
3362                 $$ = null;
3363           }
3364         ;
3365
3366 argument
3367         : expression
3368           {
3369                 $$ = new Argument ((Expression) $1);
3370           }
3371         | non_simple_argument
3372         ;
3373
3374 argument_or_named_argument
3375         : argument
3376         | named_argument
3377         ;
3378
3379 non_simple_argument
3380         : REF variable_reference
3381           {
3382                 $$ = new Argument ((Expression) $2, Argument.AType.Ref);
3383                 lbag.AddLocation ($$, GetLocation ($1));
3384           }
3385         | OUT variable_reference
3386           {
3387                 $$ = new Argument ((Expression) $2, Argument.AType.Out);
3388                 lbag.AddLocation ($$, GetLocation ($1));
3389           }
3390         | ARGLIST OPEN_PARENS argument_list CLOSE_PARENS
3391           {
3392                 $$ = new Argument (new Arglist ((Arguments) $3, GetLocation ($1)));
3393                 lbag.AddLocation ($$, GetLocation ($2), GetLocation ($4));
3394           }
3395         | ARGLIST OPEN_PARENS CLOSE_PARENS
3396           {
3397                 $$ = new Argument (new Arglist (GetLocation ($1)));
3398                 lbag.AddLocation ($$, GetLocation ($2), GetLocation ($3));
3399           }
3400         ;
3401
3402 variable_reference
3403         : expression
3404         ;
3405
3406 element_access
3407         : primary_expression OPEN_BRACKET_EXPR expression_list_arguments CLOSE_BRACKET
3408           {
3409                 $$ = new ElementAccess ((Expression) $1, (Arguments) $3, GetLocation ($2));
3410                 lbag.AddLocation ($$, GetLocation ($4));
3411           }
3412         | primary_expression OPEN_BRACKET_EXPR expression_list_arguments error
3413           {
3414                 Error_SyntaxError (yyToken);
3415                 $$ = new ElementAccess ((Expression) $1, (Arguments) $3, GetLocation ($2));
3416           }
3417         | primary_expression OPEN_BRACKET_EXPR error
3418           {
3419                 Error_SyntaxError (yyToken);
3420                 $$ = new ElementAccess ((Expression) $1, null, GetLocation ($2));
3421           }
3422         ;
3423
3424 expression_list
3425         : expression_or_error
3426           {
3427                 var list = new List<Expression> (4);
3428                 list.Add ((Expression) $1);
3429                 $$ = list;
3430           }
3431         | expression_list COMMA expression_or_error
3432           {
3433                 var list = (List<Expression>) $1;
3434                 list.Add ((Expression) $3);
3435                 $$ = list;
3436           }
3437         ;
3438
3439 expression_list_arguments
3440         : expression_list_argument
3441           {
3442                 Arguments args = new Arguments (4);
3443                 args.Add ((Argument) $1);
3444                 $$ = args;
3445           }
3446         | expression_list_arguments COMMA expression_list_argument
3447           {
3448                 Arguments args = (Arguments) $1;
3449                 if (args [args.Count - 1] is NamedArgument && !($3 is NamedArgument))
3450                         Error_NamedArgumentExpected ((NamedArgument) args [args.Count - 1]);
3451
3452                 args.Add ((Argument) $3);
3453                 $$ = args;
3454           }
3455         ;
3456
3457 expression_list_argument
3458         : expression
3459           {
3460                 $$ = new Argument ((Expression) $1);
3461           }
3462         | named_argument
3463         ;
3464
3465 this_access
3466         : THIS
3467           {
3468                 $$ = new This (GetLocation ($1));
3469           }
3470         ;
3471
3472 base_access
3473         : BASE OPEN_BRACKET_EXPR expression_list_arguments CLOSE_BRACKET
3474           {
3475                 $$ = new ElementAccess (new BaseThis (GetLocation ($1)), (Arguments) $3, GetLocation ($2));
3476                 lbag.AddLocation ($$, GetLocation ($4));
3477           }
3478         | BASE OPEN_BRACKET error
3479           {
3480                 Error_SyntaxError (yyToken);
3481                 $$ = new ElementAccess (null, null, GetLocation ($2));
3482           }
3483         ;
3484
3485 post_increment_expression
3486         : primary_expression OP_INC
3487           {
3488                 $$ = new UnaryMutator (UnaryMutator.Mode.PostIncrement, (Expression) $1, GetLocation ($2));
3489           }
3490         ;
3491
3492 post_decrement_expression
3493         : primary_expression OP_DEC
3494           {
3495                 $$ = new UnaryMutator (UnaryMutator.Mode.PostDecrement, (Expression) $1, GetLocation ($2));
3496           }
3497         ;
3498
3499 object_or_delegate_creation_expression
3500         : NEW new_expr_type open_parens_any opt_argument_list CLOSE_PARENS opt_object_or_collection_initializer
3501           {
3502                 if ($6 != null) {
3503                         if (lang_version <= LanguageVersion.ISO_2)
3504                                 FeatureIsNotAvailable (GetLocation ($1), "object initializers");
3505
3506                         $$ = new NewInitialize ((FullNamedExpression) $2, (Arguments) $4, (CollectionOrObjectInitializers) $6, GetLocation ($1));
3507                 } else {
3508                         $$ = new New ((FullNamedExpression) $2, (Arguments) $4, GetLocation ($1));
3509                 }
3510
3511                 lbag.AddLocation ($$, GetLocation ($3), GetLocation ($5));
3512           }
3513         | NEW new_expr_type object_or_collection_initializer
3514           {
3515                 if (lang_version <= LanguageVersion.ISO_2)
3516                         FeatureIsNotAvailable (GetLocation ($1), "collection initializers");
3517
3518                 $$ = new NewInitialize ((FullNamedExpression) $2, null, (CollectionOrObjectInitializers) $3, GetLocation ($1));
3519           }
3520         ;
3521
3522 array_creation_expression
3523         : NEW new_expr_type OPEN_BRACKET_EXPR expression_list CLOSE_BRACKET
3524           opt_rank_specifier
3525           opt_array_initializer
3526           {
3527                 $$ = new ArrayCreation ((FullNamedExpression) $2, (List<Expression>) $4,
3528                                 new ComposedTypeSpecifier (((List<Expression>) $4).Count, GetLocation ($3)) {
3529                                         Next = (ComposedTypeSpecifier) $6
3530                                 }, (ArrayInitializer) $7, GetLocation ($1));
3531                 lbag.AddLocation ($$, GetLocation ($3), GetLocation ($5));
3532           }
3533         | NEW new_expr_type rank_specifiers opt_array_initializer
3534           {
3535                 if ($4 == null)
3536                         report.Error (1586, GetLocation ($1), "Array creation must have array size or array initializer");
3537
3538                 $$ = new ArrayCreation ((FullNamedExpression) $2, (ComposedTypeSpecifier) $3, (ArrayInitializer) $4, GetLocation ($1));
3539           }
3540         | NEW rank_specifier array_initializer
3541           {
3542                 if (lang_version <= LanguageVersion.ISO_2)
3543                         FeatureIsNotAvailable (GetLocation ($1), "implicitly typed arrays");
3544
3545                 $$ = new ImplicitlyTypedArrayCreation ((ComposedTypeSpecifier) $2, (ArrayInitializer) $3, GetLocation ($1));
3546           }
3547         | NEW new_expr_type OPEN_BRACKET CLOSE_BRACKET OPEN_BRACKET_EXPR error CLOSE_BRACKET
3548           {
3549                 report.Error (178, GetLocation ($6), "Invalid rank specifier, expecting `,' or `]'");
3550                 $$ = new ArrayCreation ((FullNamedExpression) $2, null, GetLocation ($1));
3551           }
3552         | NEW new_expr_type error
3553           {
3554                 Error_SyntaxError (yyToken);
3555                 // It can be any of new expression, create the most common one
3556                 $$ = new New ((FullNamedExpression) $2, null, GetLocation ($1));
3557           }
3558         ;
3559
3560 new_expr_type
3561         : {
3562                 ++lexer.parsing_type;
3563           }
3564           simple_type
3565           {
3566                 --lexer.parsing_type;
3567                 $$ = $2;
3568           }
3569         ;
3570
3571 anonymous_type_expression
3572         : NEW OPEN_BRACE anonymous_type_parameters_opt_comma CLOSE_BRACE
3573           {
3574                 if (lang_version <= LanguageVersion.ISO_2)
3575                         FeatureIsNotAvailable (GetLocation ($1), "anonymous types");
3576
3577                 $$ = new NewAnonymousType ((List<AnonymousTypeParameter>) $3, current_container, GetLocation ($1));
3578
3579                 // TODO: lbag comma location
3580                 lbag.AddLocation ($$, GetLocation ($2), GetLocation ($4));
3581           }
3582         ;
3583
3584 anonymous_type_parameters_opt_comma
3585         : anonymous_type_parameters_opt
3586         | anonymous_type_parameters COMMA
3587         ;
3588
3589 anonymous_type_parameters_opt
3590         : { $$ = null; }
3591         | anonymous_type_parameters
3592         ;
3593
3594 anonymous_type_parameters
3595         : anonymous_type_parameter
3596           {
3597                 var a = new List<AnonymousTypeParameter> (4);
3598                 a.Add ((AnonymousTypeParameter) $1);
3599                 $$ = a;
3600           }
3601         | anonymous_type_parameters COMMA anonymous_type_parameter
3602           {
3603                 var a = (List<AnonymousTypeParameter>) $1;
3604                 a.Add ((AnonymousTypeParameter) $3);
3605                 $$ = a;
3606           }
3607         ;
3608
3609 anonymous_type_parameter
3610         : identifier_inside_body ASSIGN variable_initializer
3611           {
3612                 var lt = (Tokenizer.LocatedToken)$1;
3613                 $$ = new AnonymousTypeParameter ((Expression)$3, lt.Value, lt.Location);
3614                 lbag.AddLocation ($$, GetLocation ($2));
3615           }
3616         | identifier_inside_body
3617           {
3618                 var lt = (Tokenizer.LocatedToken)$1;
3619                 $$ = new AnonymousTypeParameter (new SimpleName (lt.Value, lt.Location),
3620                         lt.Value, lt.Location);
3621           }
3622         | member_access
3623           {
3624                 MemberAccess ma = (MemberAccess) $1;
3625                 $$ = new AnonymousTypeParameter (ma, ma.Name, ma.Location);
3626           }
3627         | error
3628           {
3629                 report.Error (746, lexer.Location,
3630                         "Invalid anonymous type member declarator. Anonymous type members must be a member assignment, simple name or member access expression");
3631                 $$ = null;
3632           }
3633         ;
3634
3635 opt_rank_specifier
3636         : /* empty */
3637         | rank_specifiers
3638         ;
3639
3640 rank_specifiers
3641         : rank_specifier
3642         | rank_specifier rank_specifiers
3643           {
3644                 ((ComposedTypeSpecifier) $1).Next = (ComposedTypeSpecifier) $2;
3645                 $$ = $1;
3646           }
3647         ;
3648
3649 rank_specifier
3650         : OPEN_BRACKET CLOSE_BRACKET
3651           {
3652                 $$ = ComposedTypeSpecifier.CreateArrayDimension (1, GetLocation ($1));
3653                 lbag.AddLocation ($$, GetLocation ($2));
3654           }
3655         | OPEN_BRACKET dim_separators CLOSE_BRACKET
3656           {
3657                 $$ = ComposedTypeSpecifier.CreateArrayDimension ((int)$2, GetLocation ($1));
3658                 lbag.AddLocation ($$, GetLocation ($3));
3659           }
3660         ;
3661
3662 dim_separators
3663         : COMMA
3664           {
3665                 $$ = 2;
3666           }
3667         | dim_separators COMMA
3668           {
3669                 $$ = ((int) $1) + 1;
3670           }
3671         ;
3672
3673 opt_array_initializer
3674         : /* empty */
3675           {
3676                 $$ = null;
3677           }
3678         | array_initializer
3679           {
3680                 $$ = $1;
3681           }
3682         ;
3683
3684 array_initializer
3685         : OPEN_BRACE CLOSE_BRACE
3686           {
3687                 var ai = new ArrayInitializer (0, GetLocation ($1));
3688                 ai.VariableDeclaration = current_variable;
3689                 lbag.AddLocation (ai, GetLocation ($2));
3690                 $$ = ai;
3691           }
3692         | OPEN_BRACE variable_initializer_list opt_comma CLOSE_BRACE
3693           {
3694                 var ai = new ArrayInitializer ((List<Expression>) $2, GetLocation ($1));
3695                 ai.VariableDeclaration = current_variable;
3696                 if ($3 != null) {
3697                         lbag.AddLocation (ai, GetLocation ($3), GetLocation ($4));
3698                 } else {
3699                         lbag.AddLocation (ai, GetLocation ($4));
3700                 }
3701                 $$ = ai;
3702           }
3703         ;
3704
3705 variable_initializer_list
3706         : variable_initializer
3707           {
3708                 var list = new List<Expression> (4);
3709                 list.Add ((Expression) $1);
3710                 $$ = list;
3711           }
3712         | variable_initializer_list COMMA variable_initializer
3713           {
3714                 var list = (List<Expression>) $1;
3715                 list.Add ((Expression) $3);
3716                 $$ = list;
3717           }
3718         ;
3719
3720 typeof_expression
3721         : TYPEOF
3722       {
3723                 lexer.TypeOfParsing = true;
3724           }
3725           open_parens_any typeof_type_expression CLOSE_PARENS
3726           {
3727                 lexer.TypeOfParsing = false;
3728                 $$ = new TypeOf ((FullNamedExpression) $4, GetLocation ($1));
3729                 lbag.AddLocation ($$, GetLocation ($3), GetLocation ($5));
3730           }
3731         ;
3732
3733 typeof_type_expression
3734         : type_and_void
3735         | unbound_type_name
3736         | error
3737          {
3738                 Error_TypeExpected (lexer.Location);
3739                 $$ = null;
3740          }
3741         ;
3742
3743 unbound_type_name
3744         : identifier_inside_body generic_dimension
3745           {
3746                 var lt = (Tokenizer.LocatedToken) $1;
3747
3748                 $$ = new SimpleName (lt.Value, (int) $2, lt.Location);
3749           }
3750         | qualified_alias_member identifier_inside_body generic_dimension
3751           {
3752                 var lt1 = (Tokenizer.LocatedToken) $1;
3753                 var lt2 = (Tokenizer.LocatedToken) $2;
3754
3755                 $$ = new QualifiedAliasMember (lt1.Value, lt2.Value, (int) $3, lt1.Location);
3756                 lbag.AddLocation ($$, GetLocation ($2));
3757           }
3758         | unbound_type_name DOT identifier_inside_body
3759           {
3760                 var lt = (Tokenizer.LocatedToken) $3;
3761
3762                 $$ = new MemberAccess ((Expression) $1, lt.Value, lt.Location);
3763           }
3764         | unbound_type_name DOT identifier_inside_body generic_dimension
3765           {
3766                 var lt = (Tokenizer.LocatedToken) $3;
3767
3768                 $$ = new MemberAccess ((Expression) $1, lt.Value, (int) $4, lt.Location);
3769           }
3770         | namespace_or_type_expr DOT identifier_inside_body generic_dimension
3771           {
3772                 var tne = (ATypeNameExpression) $1;
3773                 if (tne.HasTypeArguments)
3774                         Error_TypeExpected (GetLocation ($4));
3775
3776                 var lt = (Tokenizer.LocatedToken) $3;
3777                 $$ = new MemberAccess (tne, lt.Value, (int) $4, lt.Location);
3778           }
3779         ;
3780
3781 generic_dimension
3782         : GENERIC_DIMENSION
3783           {
3784                 if (lang_version < LanguageVersion.ISO_2)
3785                         FeatureIsNotAvailable (GetLocation ($1), "generics");
3786
3787                 $$ = $1;
3788           }
3789         ;
3790
3791 qualified_alias_member
3792         : IDENTIFIER DOUBLE_COLON
3793           {
3794                 var lt = (Tokenizer.LocatedToken) $1;
3795                 if (lang_version == LanguageVersion.ISO_1)
3796                         FeatureIsNotAvailable (lt.Location, "namespace alias qualifier");
3797
3798                 $$ = lt;
3799           }
3800         ;
3801
3802 sizeof_expression
3803         : SIZEOF open_parens_any type CLOSE_PARENS
3804           {
3805                 $$ = new SizeOf ((Expression) $3, GetLocation ($1));
3806                 lbag.AddLocation ($$, GetLocation ($2), GetLocation ($4));
3807           }
3808         | SIZEOF open_parens_any type error
3809           {
3810                 Error_SyntaxError (yyToken);
3811
3812                 $$ = new SizeOf ((Expression) $3, GetLocation ($1));
3813                 lbag.AddLocation ($$, GetLocation ($2));
3814           }
3815         ;
3816
3817 checked_expression
3818         : CHECKED open_parens_any expression CLOSE_PARENS
3819           {
3820                 $$ = new CheckedExpr ((Expression) $3, GetLocation ($1));
3821                 lbag.AddLocation ($$, GetLocation ($2), GetLocation ($4));
3822           }
3823         | CHECKED error
3824           {
3825                 Error_SyntaxError (yyToken);
3826
3827                 $$ = new CheckedExpr (null, GetLocation ($1));
3828           }
3829         ;
3830
3831 unchecked_expression
3832         : UNCHECKED open_parens_any expression CLOSE_PARENS
3833           {
3834                 $$ = new UnCheckedExpr ((Expression) $3, GetLocation ($1));
3835                 lbag.AddLocation ($$, GetLocation ($2), GetLocation ($4));
3836           }
3837         | UNCHECKED error
3838           {
3839                 Error_SyntaxError (yyToken);
3840
3841                 $$ = new UnCheckedExpr (null, GetLocation ($1));
3842           }
3843         ;
3844
3845 pointer_member_access
3846         : primary_expression OP_PTR IDENTIFIER opt_type_argument_list
3847           {
3848                 var lt = (Tokenizer.LocatedToken) $3;
3849                 $$ = new MemberAccess (new Indirection ((Expression) $1, GetLocation ($2)), lt.Value, (TypeArguments) $4, lt.Location);
3850           }
3851         ;
3852
3853 anonymous_method_expression
3854         : DELEGATE opt_anonymous_method_signature
3855           {
3856                 start_anonymous (false, (ParametersCompiled) $2, false, GetLocation ($1));
3857           }
3858           block
3859           {
3860                 $$ = end_anonymous ((ParametersBlock) $4);
3861           }
3862         | ASYNC DELEGATE opt_anonymous_method_signature
3863           {
3864                 start_anonymous (false, (ParametersCompiled) $3, true, GetLocation ($1));
3865           }
3866           block
3867           {
3868                 $$ = end_anonymous ((ParametersBlock) $5);
3869           }
3870         ;
3871
3872 opt_anonymous_method_signature
3873         :
3874           {
3875                 $$ = ParametersCompiled.Undefined;
3876           }
3877         | anonymous_method_signature
3878         ;
3879
3880 anonymous_method_signature
3881         : OPEN_PARENS
3882           {
3883                 valid_param_mod = ParameterModifierType.Ref | ParameterModifierType.Out;
3884           }
3885           opt_formal_parameter_list CLOSE_PARENS
3886           {
3887                 valid_param_mod = 0;
3888                 $$ = $3;
3889           }
3890         ;
3891
3892 default_value_expression
3893         : DEFAULT open_parens_any type CLOSE_PARENS
3894           {
3895                 if (lang_version < LanguageVersion.ISO_2)
3896                         FeatureIsNotAvailable (GetLocation ($1), "default value expression");
3897
3898                 $$ = new DefaultValueExpression ((Expression) $3, GetLocation ($1));
3899                 lbag.AddLocation ($$, GetLocation ($2), GetLocation ($4));
3900           }
3901         ;
3902
3903 unary_expression
3904         : primary_expression
3905         | BANG prefixed_unary_expression
3906           {
3907                 $$ = new Unary (Unary.Operator.LogicalNot, (Expression) $2, GetLocation ($1));
3908           }
3909         | TILDE prefixed_unary_expression
3910           {
3911                 $$ = new Unary (Unary.Operator.OnesComplement, (Expression) $2, GetLocation ($1));
3912           }
3913         | OPEN_PARENS_CAST type CLOSE_PARENS prefixed_unary_expression
3914           {
3915                 $$ = new Cast ((FullNamedExpression) $2, (Expression) $4, GetLocation ($1));
3916                 lbag.AddLocation ($$, GetLocation ($3));
3917           }
3918         | AWAIT prefixed_unary_expression
3919           {
3920                 if (!async_block) {
3921                          if (current_anonymous_method is LambdaExpression) {
3922                                 report.Error (4034, GetLocation ($1),
3923                                         "The `await' operator can only be used when its containing lambda expression is marked with the `async' modifier");
3924                         } else if (current_anonymous_method is AnonymousMethodExpression) {
3925                                 report.Error (4035, GetLocation ($1),
3926                                         "The `await' operator can only be used when its containing anonymous method is marked with the `async' modifier");
3927                         } else {
3928                                 report.Error (4033, GetLocation ($1),
3929                                         "The `await' operator can only be used when its containing method is marked with the `async' modifier");
3930                         }
3931                 } else {
3932                         current_block.Explicit.RegisterAsyncAwait ();
3933                 }
3934
3935                 $$ = new Await ((Expression) $2, GetLocation ($1));
3936           }
3937         | BANG error
3938           {
3939                 Error_SyntaxError (yyToken);
3940
3941                 $$ = new Unary (Unary.Operator.LogicalNot, null, GetLocation ($1));
3942           }
3943         | TILDE error
3944           {
3945                 Error_SyntaxError (yyToken);
3946
3947                 $$ = new Unary (Unary.Operator.OnesComplement, null, GetLocation ($1));
3948           }
3949         | OPEN_PARENS_CAST type CLOSE_PARENS error
3950           {
3951                 Error_SyntaxError (yyToken);
3952
3953                 $$ = new Cast ((FullNamedExpression) $2, null, GetLocation ($1));
3954                 lbag.AddLocation ($$, GetLocation ($3));
3955           }
3956         | AWAIT error
3957           {
3958                 Error_SyntaxError (yyToken);
3959
3960                 $$ = new Await (null, GetLocation ($1));
3961           }
3962         ;
3963
3964         //
3965         // The idea to split this out is from Rhys' grammar
3966         // to solve the problem with casts.
3967         //
3968 prefixed_unary_expression
3969         : unary_expression
3970         | PLUS prefixed_unary_expression
3971           {
3972                 $$ = new Unary (Unary.Operator.UnaryPlus, (Expression) $2, GetLocation ($1));
3973           }
3974         | MINUS prefixed_unary_expression
3975           {
3976                 $$ = new Unary (Unary.Operator.UnaryNegation, (Expression) $2, GetLocation ($1));
3977           }
3978         | OP_INC prefixed_unary_expression
3979           {
3980                 $$ = new UnaryMutator (UnaryMutator.Mode.PreIncrement, (Expression) $2, GetLocation ($1));
3981           }
3982         | OP_DEC prefixed_unary_expression
3983           {
3984                 $$ = new UnaryMutator (UnaryMutator.Mode.PreDecrement, (Expression) $2, GetLocation ($1));
3985           }
3986         | STAR prefixed_unary_expression
3987           {
3988                 $$ = new Indirection ((Expression) $2, GetLocation ($1));
3989           }
3990         | BITWISE_AND prefixed_unary_expression
3991           {
3992                 $$ = new Unary (Unary.Operator.AddressOf, (Expression) $2, GetLocation ($1));
3993           }
3994         | PLUS error
3995           {
3996                 Error_SyntaxError (yyToken);
3997
3998                 $$ = new Unary (Unary.Operator.UnaryPlus, null, GetLocation ($1));
3999           }
4000         | MINUS error
4001           {
4002                 Error_SyntaxError (yyToken);
4003
4004                 $$ = new Unary (Unary.Operator.UnaryNegation, null, GetLocation ($1));
4005           }
4006         | OP_INC error
4007           {
4008                 Error_SyntaxError (yyToken);
4009
4010                 $$ = new UnaryMutator (UnaryMutator.Mode.PreIncrement, null, GetLocation ($1));
4011           }
4012         | OP_DEC error
4013           {
4014                 Error_SyntaxError (yyToken);
4015
4016                 $$ = new UnaryMutator (UnaryMutator.Mode.PreDecrement, null, GetLocation ($1));
4017           }
4018         | STAR error
4019           {
4020                 Error_SyntaxError (yyToken);
4021
4022                 $$ = new Indirection (null, GetLocation ($1));
4023           }
4024         | BITWISE_AND error
4025           {
4026                 Error_SyntaxError (yyToken);
4027
4028                 $$ = new Unary (Unary.Operator.AddressOf, null, GetLocation ($1));
4029           }
4030         ;
4031
4032 multiplicative_expression
4033         : prefixed_unary_expression
4034         | multiplicative_expression STAR prefixed_unary_expression
4035           {
4036                 $$ = new Binary (Binary.Operator.Multiply, (Expression) $1, (Expression) $3);
4037                 lbag.AddLocation ($$, GetLocation ($2));
4038           }
4039         | multiplicative_expression DIV prefixed_unary_expression
4040           {
4041                 $$ = new Binary (Binary.Operator.Division, (Expression) $1, (Expression) $3);
4042                 lbag.AddLocation ($$, GetLocation ($2));
4043           }
4044         | multiplicative_expression PERCENT prefixed_unary_expression
4045           {
4046                 $$ = new Binary (Binary.Operator.Modulus, (Expression) $1, (Expression) $3);
4047                 lbag.AddLocation ($$, GetLocation ($2));
4048           }
4049         | multiplicative_expression STAR error
4050           {
4051                 Error_SyntaxError (yyToken);
4052
4053                 $$ = new Binary (Binary.Operator.Multiply, (Expression) $1, null);
4054                 lbag.AddLocation ($$, GetLocation ($2));
4055           }
4056         | multiplicative_expression DIV error
4057           {
4058                 Error_SyntaxError (yyToken);
4059
4060                 $$ = new Binary (Binary.Operator.Division, (Expression) $1, null);
4061                 lbag.AddLocation ($$, GetLocation ($2));
4062           }
4063         | multiplicative_expression PERCENT error
4064           {
4065                 Error_SyntaxError (yyToken);
4066
4067                 $$ = new Binary (Binary.Operator.Modulus, (Expression) $1, null);
4068                 lbag.AddLocation ($$, GetLocation ($2));
4069           }
4070         ;
4071
4072 additive_expression
4073         : multiplicative_expression
4074         | additive_expression PLUS multiplicative_expression
4075           {
4076                 $$ = new Binary (Binary.Operator.Addition, (Expression) $1, (Expression) $3);
4077                 lbag.AddLocation ($$, GetLocation ($2));
4078           }
4079         | additive_expression MINUS multiplicative_expression
4080           {
4081                 $$ = new Binary (Binary.Operator.Subtraction, (Expression) $1, (Expression) $3);
4082                 lbag.AddLocation ($$, GetLocation ($2));
4083           }
4084         | additive_expression AS type
4085           {
4086                 $$ = new As ((Expression) $1, (Expression) $3, GetLocation ($2));
4087           }
4088         | additive_expression IS type
4089           {
4090                 $$ = new Is ((Expression) $1, (Expression) $3, GetLocation ($2));
4091           }
4092         | additive_expression PLUS error
4093           {
4094                 Error_SyntaxError (yyToken);
4095
4096                 $$ = new Binary (Binary.Operator.Addition, (Expression) $1, null);
4097                 lbag.AddLocation ($$, GetLocation ($2));
4098           }
4099         | additive_expression MINUS error
4100           {
4101                 Error_SyntaxError (yyToken);
4102
4103                 $$ = new Binary (Binary.Operator.Subtraction, (Expression) $1, null);
4104                 lbag.AddLocation ($$, GetLocation ($2));
4105           }
4106         | additive_expression AS error
4107           {
4108                 Error_SyntaxError (yyToken);
4109
4110                 $$ = new As ((Expression) $1, null, GetLocation ($2));
4111           }
4112         | additive_expression IS error
4113           {
4114                 Error_SyntaxError (yyToken);
4115
4116                 $$ = new Is ((Expression) $1, null, GetLocation ($2));
4117           }
4118         ;
4119
4120 shift_expression
4121         : additive_expression
4122         | shift_expression OP_SHIFT_LEFT additive_expression
4123           {
4124                 $$ = new Binary (Binary.Operator.LeftShift, (Expression) $1, (Expression) $3);
4125                 lbag.AddLocation ($$, GetLocation ($2));
4126           }
4127         | shift_expression OP_SHIFT_RIGHT additive_expression
4128           {
4129                 $$ = new Binary (Binary.Operator.RightShift, (Expression) $1, (Expression) $3);
4130                 lbag.AddLocation ($$, GetLocation ($2));
4131           }
4132         | shift_expression OP_SHIFT_LEFT error
4133           {
4134                 Error_SyntaxError (yyToken);
4135
4136                 $$ = new Binary (Binary.Operator.LeftShift, (Expression) $1, null);
4137                 lbag.AddLocation ($$, GetLocation ($2));
4138           }
4139         | shift_expression OP_SHIFT_RIGHT error
4140           {
4141                 Error_SyntaxError (yyToken);
4142
4143                 $$ = new Binary (Binary.Operator.RightShift, (Expression) $1, null);
4144                 lbag.AddLocation ($$, GetLocation ($2));
4145           }
4146         ;
4147
4148 relational_expression
4149         : shift_expression
4150         | relational_expression OP_LT shift_expression
4151           {
4152                 $$ = new Binary (Binary.Operator.LessThan, (Expression) $1, (Expression) $3);
4153                 lbag.AddLocation ($$, GetLocation ($2));
4154           }
4155         | relational_expression OP_GT shift_expression
4156           {
4157                 $$ = new Binary (Binary.Operator.GreaterThan, (Expression) $1, (Expression) $3);
4158                 lbag.AddLocation ($$, GetLocation ($2));
4159           }
4160         | relational_expression OP_LE shift_expression
4161           {
4162                 $$ = new Binary (Binary.Operator.LessThanOrEqual, (Expression) $1, (Expression) $3);
4163                 lbag.AddLocation ($$, GetLocation ($2));
4164           }
4165         | relational_expression OP_GE shift_expression
4166           {
4167                 $$ = new Binary (Binary.Operator.GreaterThanOrEqual, (Expression) $1, (Expression) $3);
4168                 lbag.AddLocation ($$, GetLocation ($2));
4169           }
4170         | relational_expression OP_LT error
4171           {
4172                 Error_SyntaxError (yyToken);
4173
4174                 $$ = new Binary (Binary.Operator.LessThan, (Expression) $1, null);
4175                 lbag.AddLocation ($$, GetLocation ($2));
4176           }
4177         | relational_expression OP_GT error
4178           {
4179                 Error_SyntaxError (yyToken);
4180
4181                 $$ = new Binary (Binary.Operator.GreaterThan, (Expression) $1, null);
4182                 lbag.AddLocation ($$, GetLocation ($2));
4183           }
4184         | relational_expression OP_LE error
4185           {
4186                 Error_SyntaxError (yyToken);
4187
4188                 $$ = new Binary (Binary.Operator.LessThanOrEqual, (Expression) $1, null);
4189                 lbag.AddLocation ($$, GetLocation ($2));
4190           }
4191         | relational_expression OP_GE error
4192           {
4193                 Error_SyntaxError (yyToken);
4194
4195                 $$ = new Binary (Binary.Operator.GreaterThanOrEqual, (Expression) $1, null);
4196                 lbag.AddLocation ($$, GetLocation ($2));
4197           }
4198         ;
4199
4200 equality_expression
4201         : relational_expression
4202         | equality_expression OP_EQ relational_expression
4203           {
4204                 $$ = new Binary (Binary.Operator.Equality, (Expression) $1, (Expression) $3);
4205                 lbag.AddLocation ($$, GetLocation ($2));
4206           }
4207         | equality_expression OP_NE relational_expression
4208           {
4209                 $$ = new Binary (Binary.Operator.Inequality, (Expression) $1, (Expression) $3);
4210                 lbag.AddLocation ($$, GetLocation ($2));
4211           }
4212         | equality_expression OP_EQ error
4213           {
4214                 Error_SyntaxError (yyToken);
4215
4216                 $$ = new Binary (Binary.Operator.Equality, (Expression) $1, null);
4217                 lbag.AddLocation ($$, GetLocation ($2));
4218           }
4219         | equality_expression OP_NE error
4220           {
4221                 Error_SyntaxError (yyToken);
4222
4223                 $$ = new Binary (Binary.Operator.Inequality, (Expression) $1, null);
4224                 lbag.AddLocation ($$, GetLocation ($2));
4225           }
4226         ;
4227
4228 and_expression
4229         : equality_expression
4230         | and_expression BITWISE_AND equality_expression
4231           {
4232                 $$ = new Binary (Binary.Operator.BitwiseAnd, (Expression) $1, (Expression) $3);
4233                 lbag.AddLocation ($$, GetLocation ($2));
4234           }
4235         | and_expression BITWISE_AND error
4236           {
4237                 Error_SyntaxError (yyToken);
4238
4239                 $$ = new Binary (Binary.Operator.BitwiseAnd, (Expression) $1, null);
4240                 lbag.AddLocation ($$, GetLocation ($2));
4241           }
4242         ;
4243
4244 exclusive_or_expression
4245         : and_expression
4246         | exclusive_or_expression CARRET and_expression
4247           {
4248                 $$ = new Binary (Binary.Operator.ExclusiveOr, (Expression) $1, (Expression) $3);
4249                 lbag.AddLocation ($$, GetLocation ($2));
4250           }
4251         | exclusive_or_expression CARRET error
4252           {
4253                 Error_SyntaxError (yyToken);
4254
4255                 $$ = new Binary (Binary.Operator.ExclusiveOr, (Expression) $1, null);
4256                 lbag.AddLocation ($$, GetLocation ($2));
4257           }
4258         ;
4259
4260 inclusive_or_expression
4261         : exclusive_or_expression
4262         | inclusive_or_expression BITWISE_OR exclusive_or_expression
4263           {
4264                 $$ = new Binary (Binary.Operator.BitwiseOr, (Expression) $1, (Expression) $3);
4265                 lbag.AddLocation ($$, GetLocation ($2));
4266           }
4267         | inclusive_or_expression BITWISE_OR error
4268           {
4269                 Error_SyntaxError (yyToken);
4270
4271                 $$ = new Binary (Binary.Operator.BitwiseOr, (Expression) $1, null);
4272                 lbag.AddLocation ($$, GetLocation ($2));
4273           }
4274         ;
4275
4276 conditional_and_expression
4277         : inclusive_or_expression
4278         | conditional_and_expression OP_AND inclusive_or_expression
4279           {
4280                 $$ = new Binary (Binary.Operator.LogicalAnd, (Expression) $1, (Expression) $3);
4281                 lbag.AddLocation ($$, GetLocation ($2));
4282           }
4283         | conditional_and_expression OP_AND error
4284           {
4285                 Error_SyntaxError (yyToken);
4286
4287                 $$ = new Binary (Binary.Operator.LogicalAnd, (Expression) $1, null);
4288                 lbag.AddLocation ($$, GetLocation ($2));
4289           }
4290         ;
4291
4292 conditional_or_expression
4293         : conditional_and_expression
4294         | conditional_or_expression OP_OR conditional_and_expression
4295           {
4296                 $$ = new Binary (Binary.Operator.LogicalOr, (Expression) $1, (Expression) $3);
4297                 lbag.AddLocation ($$, GetLocation ($2));
4298           }
4299         | conditional_or_expression OP_OR error
4300           {
4301                 Error_SyntaxError (yyToken);
4302
4303                 $$ = new Binary (Binary.Operator.LogicalOr, (Expression) $1, null);
4304                 lbag.AddLocation ($$, GetLocation ($2));
4305           }
4306         ;
4307
4308 null_coalescing_expression
4309         : conditional_or_expression
4310         | conditional_or_expression OP_COALESCING null_coalescing_expression
4311           {
4312                 if (lang_version < LanguageVersion.ISO_2)
4313                         FeatureIsNotAvailable (GetLocation ($2), "null coalescing operator");
4314
4315                 $$ = new Nullable.NullCoalescingOperator ((Expression) $1, (Expression) $3);
4316                 lbag.AddLocation ($$, GetLocation ($2));
4317           }
4318         ;
4319
4320 conditional_expression
4321         : null_coalescing_expression
4322         | null_coalescing_expression INTERR expression COLON expression
4323           {
4324                 $$ = new Conditional (new BooleanExpression ((Expression) $1), (Expression) $3, (Expression) $5, GetLocation ($2));
4325                 lbag.AddLocation ($$, GetLocation ($4));
4326           }
4327         | null_coalescing_expression INTERR expression error
4328           {
4329                 Error_SyntaxError (yyToken);
4330
4331                 $$ = new Conditional (new BooleanExpression ((Expression) $1), (Expression) $3, null, GetLocation ($2));
4332           }
4333         | null_coalescing_expression INTERR expression COLON error
4334           {
4335                 Error_SyntaxError (yyToken);
4336
4337                 $$ = new Conditional (new BooleanExpression ((Expression) $1), (Expression) $3, null, GetLocation ($2));
4338                 lbag.AddLocation ($$, GetLocation ($4));
4339           }
4340         ;
4341
4342 assignment_expression
4343         : prefixed_unary_expression ASSIGN expression
4344           {
4345                 $$ = new SimpleAssign ((Expression) $1, (Expression) $3);
4346                 lbag.AddLocation ($$, GetLocation ($2));
4347           }
4348         | prefixed_unary_expression OP_MULT_ASSIGN expression
4349           {
4350                 $$ = new CompoundAssign (Binary.Operator.Multiply, (Expression) $1, (Expression) $3);
4351                 lbag.AddLocation ($$, GetLocation ($2));
4352           }
4353         | prefixed_unary_expression OP_DIV_ASSIGN expression
4354           {
4355                 $$ = new CompoundAssign (Binary.Operator.Division, (Expression) $1, (Expression) $3);
4356                 lbag.AddLocation ($$, GetLocation ($2));
4357           }
4358         | prefixed_unary_expression OP_MOD_ASSIGN expression
4359           {
4360                 $$ = new CompoundAssign (Binary.Operator.Modulus, (Expression) $1, (Expression) $3);
4361                 lbag.AddLocation ($$, GetLocation ($2));
4362           }
4363         | prefixed_unary_expression OP_ADD_ASSIGN expression
4364           {
4365                 $$ = new CompoundAssign (Binary.Operator.Addition, (Expression) $1, (Expression) $3);
4366                 lbag.AddLocation ($$, GetLocation ($2));
4367           }
4368         | prefixed_unary_expression OP_SUB_ASSIGN expression
4369           {
4370                 $$ = new CompoundAssign (Binary.Operator.Subtraction, (Expression) $1, (Expression) $3);
4371                 lbag.AddLocation ($$, GetLocation ($2));
4372           }
4373         | prefixed_unary_expression OP_SHIFT_LEFT_ASSIGN expression
4374           {
4375                 $$ = new CompoundAssign (Binary.Operator.LeftShift, (Expression) $1, (Expression) $3);
4376                 lbag.AddLocation ($$, GetLocation ($2));
4377           }
4378         | prefixed_unary_expression OP_SHIFT_RIGHT_ASSIGN expression
4379           {
4380                 $$ = new CompoundAssign (Binary.Operator.RightShift, (Expression) $1, (Expression) $3);
4381                 lbag.AddLocation ($$, GetLocation ($2));
4382           }
4383         | prefixed_unary_expression OP_AND_ASSIGN expression
4384           {
4385                 $$ = new CompoundAssign (Binary.Operator.BitwiseAnd, (Expression) $1, (Expression) $3);
4386                 lbag.AddLocation ($$, GetLocation ($2));
4387           }
4388         | prefixed_unary_expression OP_OR_ASSIGN expression
4389           {
4390                 $$ = new CompoundAssign (Binary.Operator.BitwiseOr, (Expression) $1, (Expression) $3);
4391                 lbag.AddLocation ($$, GetLocation ($2));
4392           }
4393         | prefixed_unary_expression OP_XOR_ASSIGN expression
4394           {
4395                 $$ = new CompoundAssign (Binary.Operator.ExclusiveOr, (Expression) $1, (Expression) $3);
4396                 lbag.AddLocation ($$, GetLocation ($2));
4397           }
4398         ;
4399
4400 lambda_parameter_list
4401         : lambda_parameter
4402           {
4403                 var pars = new List<Parameter> (4);
4404                 pars.Add ((Parameter) $1);
4405
4406                 $$ = pars;
4407           }
4408         | lambda_parameter_list COMMA lambda_parameter
4409           {
4410                 var pars = (List<Parameter>) $1;
4411                 Parameter p = (Parameter)$3;
4412                 if (pars[0].GetType () != p.GetType ()) {
4413                         report.Error (748, p.Location, "All lambda parameters must be typed either explicitly or implicitly");
4414                 }
4415
4416                 pars.Add (p);
4417                 $$ = pars;
4418           }
4419         ;
4420
4421 lambda_parameter
4422         : parameter_modifier parameter_type identifier_inside_body
4423           {
4424                 var lt = (Tokenizer.LocatedToken) $3;
4425
4426                 $$ = new Parameter ((FullNamedExpression) $2, lt.Value, (Parameter.Modifier) $1, null, lt.Location);
4427           }
4428         | parameter_type identifier_inside_body
4429           {
4430                 var lt = (Tokenizer.LocatedToken) $2;
4431
4432                 $$ = new Parameter ((FullNamedExpression) $1, lt.Value, Parameter.Modifier.NONE, null, lt.Location);
4433           }
4434         | IDENTIFIER
4435           {
4436                 var lt = (Tokenizer.LocatedToken) $1;
4437                 $$ = new ImplicitLambdaParameter (lt.Value, lt.Location);
4438           }
4439         | AWAIT
4440           {
4441                 var lt = (Tokenizer.LocatedToken) Error_AwaitAsIdentifier ($1);
4442                 $$ = new ImplicitLambdaParameter (lt.Value, lt.Location);
4443           }
4444         ;
4445
4446 opt_lambda_parameter_list
4447         : /* empty */                   { $$ = ParametersCompiled.EmptyReadOnlyParameters; }
4448         | lambda_parameter_list         {
4449                 var pars_list = (List<Parameter>) $1;
4450                 $$ = new ParametersCompiled (pars_list.ToArray ());
4451           }
4452         ;
4453
4454 lambda_expression_body
4455         : {
4456                 start_block (Location.Null);
4457           }
4458           expression    // All expressions must handle error or current block won't be restored and breaking ast completely
4459           {
4460                 Block b = end_block (Location.Null);
4461                 b.IsCompilerGenerated = true;
4462                 b.AddStatement (new ContextualReturn ((Expression) $2));
4463                 $$ = b;
4464           }
4465         | block
4466         | error
4467           {
4468                 // Handles only cases like foo = x.FirstOrDefault (l => );
4469                 // where we must restore current_variable
4470                 Block b = end_block (Location.Null);
4471                 b.IsCompilerGenerated = true;
4472
4473                 Error_SyntaxError (yyToken);
4474                 $$ = null;
4475           }
4476         ;
4477
4478 expression_or_error
4479         : expression
4480         | error
4481           {
4482                 Error_SyntaxError (yyToken);
4483                 $$ = null;
4484           }
4485         ;
4486
4487 lambda_expression
4488         : IDENTIFIER ARROW
4489           {
4490                 var lt = (Tokenizer.LocatedToken) $1;
4491                 Parameter p = new ImplicitLambdaParameter (lt.Value, lt.Location);
4492                 start_anonymous (true, new ParametersCompiled (p), false, lt.Location);
4493           }
4494           lambda_expression_body
4495           {
4496                 $$ = end_anonymous ((ParametersBlock) $4);
4497                 lbag.AddLocation ($$, GetLocation ($2));
4498           }
4499         | AWAIT ARROW
4500           {
4501                 var lt = (Tokenizer.LocatedToken) Error_AwaitAsIdentifier ($1);
4502                 Parameter p = new ImplicitLambdaParameter (lt.Value, lt.Location);
4503                 start_anonymous (true, new ParametersCompiled (p), false, lt.Location);
4504           }
4505           lambda_expression_body
4506           {
4507                 $$ = end_anonymous ((ParametersBlock) $4);
4508                 lbag.AddLocation ($$, GetLocation ($2));
4509           }
4510         | ASYNC identifier_inside_body ARROW
4511           {
4512                 var lt = (Tokenizer.LocatedToken) $2;
4513                 Parameter p = new ImplicitLambdaParameter (lt.Value, lt.Location);
4514                 start_anonymous (true, new ParametersCompiled (p), true, lt.Location);
4515           }
4516           lambda_expression_body
4517           {
4518                 $$ = end_anonymous ((ParametersBlock) $5);
4519                 lbag.AddLocation ($$, GetLocation ($1), GetLocation ($3));
4520           }
4521         | OPEN_PARENS_LAMBDA
4522           {
4523                 valid_param_mod = ParameterModifierType.Ref | ParameterModifierType.Out;
4524           }
4525           opt_lambda_parameter_list CLOSE_PARENS ARROW
4526           {
4527                 valid_param_mod = 0;
4528                 start_anonymous (true, (ParametersCompiled) $3, false, GetLocation ($1));
4529           }
4530           lambda_expression_body
4531           {
4532                 $$ = end_anonymous ((ParametersBlock) $7);
4533                 lbag.AddLocation ($$, GetLocation ($1), GetLocation ($4), GetLocation ($5));
4534           }
4535         | ASYNC OPEN_PARENS_LAMBDA
4536           {
4537                 valid_param_mod = ParameterModifierType.Ref | ParameterModifierType.Out;
4538           }
4539           opt_lambda_parameter_list CLOSE_PARENS ARROW
4540           {
4541                 valid_param_mod = 0;
4542                 start_anonymous (true, (ParametersCompiled) $4, true, GetLocation ($1));
4543           }
4544           lambda_expression_body
4545           {
4546                 $$ = end_anonymous ((ParametersBlock) $8);
4547                 lbag.AddLocation ($$, GetLocation ($1), GetLocation ($2), GetLocation ($5), GetLocation ($6));
4548           }
4549         ;
4550
4551 expression
4552         : assignment_expression
4553         | non_assignment_expression
4554         ;
4555
4556 non_assignment_expression
4557         : conditional_expression
4558         | lambda_expression
4559         | query_expression
4560         | ARGLIST
4561           {
4562                 $$ = new ArglistAccess (GetLocation ($1));
4563           }
4564         ;
4565
4566 undocumented_expressions
4567         : REFVALUE OPEN_PARENS non_assignment_expression COMMA type CLOSE_PARENS
4568           {
4569                 $$ = new RefValueExpr ((Expression) $3, (FullNamedExpression) $5, GetLocation ($1));
4570                 lbag.AddLocation ($$, GetLocation ($2), GetLocation ($4), GetLocation ($6));
4571           }
4572         | REFTYPE open_parens_any expression CLOSE_PARENS
4573           {
4574                 $$ = new RefTypeExpr ((Expression) $3, GetLocation ($1));
4575                 lbag.AddLocation ($$, GetLocation ($2), GetLocation ($4));
4576           }
4577         | MAKEREF open_parens_any expression CLOSE_PARENS
4578           {
4579                 $$ = new MakeRefExpr ((Expression) $3, GetLocation ($1));
4580                 lbag.AddLocation ($$, GetLocation ($2), GetLocation ($4));
4581           }
4582         ;
4583
4584 constant_expression
4585         : expression
4586         ;
4587
4588 boolean_expression
4589         : expression
4590           {
4591                 $$ = new BooleanExpression ((Expression) $1);
4592           }
4593         ;
4594
4595 //
4596 // 10 classes
4597 //
4598 class_declaration
4599         : opt_attributes
4600           opt_modifiers
4601           opt_partial
4602           CLASS
4603           {
4604           }
4605           type_declaration_name
4606           {
4607                 lexer.ConstraintsParsing = true;
4608
4609                 Class c = new Class (current_container, (MemberName) $6, (Modifiers) $2, (Attributes) $1);
4610                 if (((c.ModFlags & Modifiers.STATIC) != 0) && lang_version == LanguageVersion.ISO_1) {
4611                         FeatureIsNotAvailable (c.Location, "static classes");
4612                 }
4613
4614                 push_current_container (c, $3);
4615           }
4616           opt_class_base
4617           opt_type_parameter_constraints_clauses
4618           {
4619                 lexer.ConstraintsParsing = false;
4620
4621                 if ($9 != null)
4622                         current_container.SetConstraints ((List<Constraints>) $9);
4623                 lbag.AddMember (current_container, mod_locations, GetLocation ($4));
4624
4625                 if (doc_support) {
4626                         current_container.PartialContainer.DocComment = Lexer.consume_doc_comment ();
4627                         Lexer.doc_state = XmlCommentState.Allowed;
4628                 }
4629
4630                 lexer.parsing_modifiers = true;
4631           }
4632           OPEN_BRACE opt_class_member_declarations CLOSE_BRACE
4633           {
4634                 --lexer.parsing_declaration;
4635                 if (doc_support)
4636                         Lexer.doc_state = XmlCommentState.Allowed;
4637           }
4638           opt_semicolon
4639           {
4640                 lbag.AppendToMember (current_container, GetLocation ($11), GetLocation ($13), GetLocation ($15));
4641                 $$ = pop_current_class ();
4642           }
4643         ;
4644
4645 opt_partial
4646         : /* empty */
4647           { $$ = null; }
4648         | PARTIAL
4649           { $$ = $1; } // location
4650         ;
4651
4652 opt_modifiers
4653         : /* empty */
4654           {
4655             mod_locations = null;
4656                 $$ = ModifierNone;
4657                 lexer.parsing_modifiers = false;
4658           }
4659         | modifiers
4660           {
4661                 lexer.parsing_modifiers = false;
4662           }
4663         ;
4664
4665 modifiers
4666         : modifier
4667         | modifiers modifier
4668           {
4669                 var m1 = (Modifiers) $1;
4670                 var m2 = (Modifiers) $2;
4671
4672                 if ((m1 & m2) != 0) {
4673                         report.Error (1004, lexer.Location - ModifiersExtensions.Name (m2).Length,
4674                                 "Duplicate `{0}' modifier", ModifiersExtensions.Name (m2));
4675                 } else if ((m2 & Modifiers.AccessibilityMask) != 0 && (m1 & Modifiers.AccessibilityMask) != 0 &&
4676                         ((m2 | m1 & Modifiers.AccessibilityMask) != (Modifiers.PROTECTED | Modifiers.INTERNAL))) {
4677                         report.Error (107, lexer.Location - ModifiersExtensions.Name (m2).Length,
4678                                 "More than one protection modifier specified");
4679                 }
4680
4681                 $$ = m1 | m2;
4682           }
4683         ;
4684
4685 modifier
4686         : NEW
4687           {
4688                 $$ = Modifiers.NEW;
4689                 StoreModifierLocation ($$, GetLocation ($1));
4690
4691                 if (current_container.Kind == MemberKind.Namespace)
4692                         report.Error (1530, GetLocation ($1), "Keyword `new' is not allowed on namespace elements");
4693           }
4694         | PUBLIC
4695           {
4696                 $$ = Modifiers.PUBLIC;
4697                 StoreModifierLocation ($$, GetLocation ($1));
4698           }
4699         | PROTECTED
4700           {
4701                 $$ = Modifiers.PROTECTED;
4702                 StoreModifierLocation ($$, GetLocation ($1));
4703           }
4704         | INTERNAL
4705           {
4706                 $$ = Modifiers.INTERNAL;
4707                 StoreModifierLocation ($$, GetLocation ($1));
4708           }
4709         | PRIVATE
4710           {
4711                 $$ = Modifiers.PRIVATE;
4712                 StoreModifierLocation ($$, GetLocation ($1));
4713           }
4714         | ABSTRACT
4715           {
4716                 $$ = Modifiers.ABSTRACT;
4717                 StoreModifierLocation ($$, GetLocation ($1));
4718           }
4719         | SEALED
4720           {
4721                 $$ = Modifiers.SEALED;
4722                 StoreModifierLocation ($$, GetLocation ($1));
4723           }
4724         | STATIC
4725           {
4726                 $$ = Modifiers.STATIC;
4727                 StoreModifierLocation ($$, GetLocation ($1));
4728           }
4729         | READONLY
4730           {
4731                 $$ = Modifiers.READONLY;
4732                 StoreModifierLocation ($$, GetLocation ($1));
4733           }
4734         | VIRTUAL
4735           {
4736                 $$ = Modifiers.VIRTUAL;
4737                 StoreModifierLocation ($$, GetLocation ($1));
4738           }
4739         | OVERRIDE
4740           {
4741                 $$ = Modifiers.OVERRIDE;
4742                 StoreModifierLocation ($$, GetLocation ($1));
4743           }
4744         | EXTERN
4745           {
4746                 $$ = Modifiers.EXTERN;
4747                 StoreModifierLocation ($$, GetLocation ($1));
4748           }
4749         | VOLATILE
4750           {
4751                 $$ = Modifiers.VOLATILE;
4752                 StoreModifierLocation ($$, GetLocation ($1));
4753           }
4754         | UNSAFE
4755           {
4756                 $$ = Modifiers.UNSAFE;
4757                 StoreModifierLocation ($$, GetLocation ($1));
4758                 if (!settings.Unsafe)
4759                         Error_UnsafeCodeNotAllowed (GetLocation ($1));
4760           }
4761         | ASYNC
4762           {
4763                 $$ = Modifiers.ASYNC;
4764                 StoreModifierLocation ($$, GetLocation ($1));
4765           }
4766         ;
4767
4768 opt_class_base
4769         : /* empty */
4770         | COLON type_list
4771          {
4772                 current_type.AddBasesForPart ((List<FullNamedExpression>) $2);
4773          }
4774         | COLON type_list error
4775           {
4776                 Error_SyntaxError (yyToken);
4777
4778                 current_type.AddBasesForPart ((List<FullNamedExpression>) $2);
4779           }
4780         ;
4781
4782 opt_type_parameter_constraints_clauses
4783         : /* empty */
4784         | type_parameter_constraints_clauses
4785           {
4786                 $$ = $1;
4787           }
4788         ;
4789
4790 type_parameter_constraints_clauses
4791         : type_parameter_constraints_clause
4792           {
4793                 var constraints = new List<Constraints> (1);
4794                 constraints.Add ((Constraints) $1);
4795                 $$ = constraints;
4796           }
4797         | type_parameter_constraints_clauses type_parameter_constraints_clause
4798           {
4799                 var constraints = (List<Constraints>) $1;
4800                 Constraints new_constraint = (Constraints)$2;
4801
4802                 foreach (Constraints c in constraints) {
4803                         if (new_constraint.TypeParameter.Value == c.TypeParameter.Value) {
4804                                 report.Error (409, new_constraint.Location,
4805                                         "A constraint clause has already been specified for type parameter `{0}'",
4806                                         new_constraint.TypeParameter.Value);
4807                         }
4808                 }
4809
4810                 constraints.Add (new_constraint);
4811                 $$ = constraints;
4812           }
4813         ;
4814
4815 type_parameter_constraints_clause
4816         : WHERE IDENTIFIER COLON type_parameter_constraints
4817           {
4818                 var lt = (Tokenizer.LocatedToken) $2;
4819                 $$ = new Constraints (new SimpleMemberName (lt.Value, lt.Location), (List<FullNamedExpression>) $4, GetLocation ($1));
4820                 lbag.AddLocation ($$, GetLocation ($3));
4821           }
4822         | WHERE IDENTIFIER error
4823           {
4824                 Error_SyntaxError (yyToken);
4825
4826                 var lt = (Tokenizer.LocatedToken) $2;
4827                 $$ = new Constraints (new SimpleMemberName (lt.Value, lt.Location), null, GetLocation ($1));
4828           }
4829         ;
4830
4831 type_parameter_constraints
4832         : type_parameter_constraint
4833           {
4834                 var constraints = new List<FullNamedExpression> (1);
4835                 constraints.Add ((FullNamedExpression) $1);
4836                 $$ = constraints;
4837           }
4838         | type_parameter_constraints COMMA type_parameter_constraint
4839           {
4840                 var constraints = (List<FullNamedExpression>) $1;
4841                 var prev = constraints [constraints.Count - 1] as SpecialContraintExpr;
4842                 if (prev != null && (prev.Constraint & SpecialConstraint.Constructor) != 0) {
4843                         report.Error (401, GetLocation ($2), "The `new()' constraint must be the last constraint specified");
4844                 }
4845
4846                 prev = $3 as SpecialContraintExpr;
4847                 if (prev != null) {
4848                         if ((prev.Constraint & (SpecialConstraint.Class | SpecialConstraint.Struct)) != 0) {
4849                                 report.Error (449, prev.Location, "The `class' or `struct' constraint must be the first constraint specified");
4850                         } else {
4851                                 prev = constraints [0] as SpecialContraintExpr;
4852                                 if (prev != null && (prev.Constraint & SpecialConstraint.Struct) != 0) {
4853                                         report.Error (451, GetLocation ($3), "The `new()' constraint cannot be used with the `struct' constraint");
4854                                 }
4855                         }
4856                 }
4857
4858                 constraints.Add ((FullNamedExpression) $3);
4859                 $$ = constraints;
4860           }
4861         ;
4862
4863 type_parameter_constraint
4864         : type
4865           {
4866                 if ($1 is ComposedCast)
4867                         report.Error (706, GetLocation ($1), "Invalid constraint type `{0}'", ((ComposedCast)$1).GetSignatureForError ());
4868
4869                 $$ = $1;
4870           }
4871         | NEW OPEN_PARENS CLOSE_PARENS
4872           {
4873                 $$ = new SpecialContraintExpr (SpecialConstraint.Constructor, GetLocation ($1));
4874                 lbag.AddLocation ($$, GetLocation ($2), GetLocation ($3));
4875           }
4876         | CLASS
4877           {
4878                 $$ = new SpecialContraintExpr (SpecialConstraint.Class, GetLocation ($1));
4879           }
4880         | STRUCT
4881           {
4882                 $$ = new SpecialContraintExpr (SpecialConstraint.Struct, GetLocation ($1));
4883           }
4884         ;
4885
4886 opt_type_parameter_variance
4887         : /* empty */
4888           {
4889                 $$ = Variance.None;
4890           }
4891         | type_parameter_variance
4892           {
4893                 if (lang_version <= LanguageVersion.V_3)
4894                         FeatureIsNotAvailable (lexer.Location, "generic type variance");
4895
4896                 $$ = $1;
4897           }
4898         ;
4899
4900 type_parameter_variance
4901         : OUT
4902           {
4903                 $$ = Variance.Covariant;
4904           }
4905         | IN
4906           {
4907                 $$ = Variance.Contravariant;
4908           }
4909         ;
4910
4911 //
4912 // Statements (8.2)
4913 //
4914
4915 //
4916 // A block is "contained" on the following places:
4917 //      method_body
4918 //      property_declaration as part of the accessor body (get/set)
4919 //      operator_declaration
4920 //      constructor_declaration
4921 //      destructor_declaration
4922 //      event_declaration as part of add_accessor_declaration or remove_accessor_declaration
4923 //
4924 block
4925         : OPEN_BRACE
4926           {
4927                 ++lexer.parsing_block;
4928                 start_block (GetLocation ($1));
4929           }
4930           opt_statement_list block_end
4931           {
4932                 $$ = $4;
4933           }
4934         ;
4935
4936 block_end
4937         : CLOSE_BRACE
4938           {
4939                 --lexer.parsing_block;
4940                 $$ = end_block (GetLocation ($1));
4941           }
4942         | COMPLETE_COMPLETION
4943           {
4944                 --lexer.parsing_block;
4945                 $$ = end_block (lexer.Location);
4946           }
4947         ;
4948
4949
4950 block_prepared
4951         : OPEN_BRACE
4952           {
4953                 ++lexer.parsing_block;
4954                 current_block.StartLocation = GetLocation ($1);
4955           }
4956           opt_statement_list CLOSE_BRACE
4957           {
4958                 --lexer.parsing_block;
4959                 $$ = end_block (GetLocation ($4));
4960           }
4961         ;
4962
4963 opt_statement_list
4964         : /* empty */
4965         | statement_list
4966         ;
4967
4968 statement_list
4969         : statement
4970         | statement_list statement
4971         ;
4972
4973 statement
4974         : block_variable_declaration
4975           {
4976                 current_block.AddStatement ((Statement) $1);
4977           }
4978         | valid_declaration_statement
4979           {
4980                 current_block.AddStatement ((Statement) $1);
4981           }
4982         | labeled_statement
4983         | error
4984           {
4985                 Error_SyntaxError (yyToken);
4986                 $$ = null;
4987           }
4988         ;
4989
4990 //
4991 // The interactive_statement and its derivatives are only
4992 // used to provide a special version of `expression_statement'
4993 // that has a side effect of assigning the expression to
4994 // $retval
4995 //
4996 interactive_statement_list
4997         : interactive_statement
4998         | interactive_statement_list interactive_statement
4999         ;
5000
5001 interactive_statement
5002         : block_variable_declaration
5003           {
5004                 current_block.AddStatement ((Statement) $1);
5005           }
5006         | interactive_valid_declaration_statement
5007           {
5008                 current_block.AddStatement ((Statement) $1);
5009           }
5010         | labeled_statement
5011         ;
5012
5013 valid_declaration_statement
5014         : block
5015         | empty_statement
5016         | expression_statement
5017         | selection_statement
5018         | iteration_statement
5019         | jump_statement
5020         | try_statement
5021         | checked_statement
5022         | unchecked_statement
5023         | lock_statement
5024         | using_statement
5025         | unsafe_statement
5026         | fixed_statement
5027         ;
5028
5029 interactive_valid_declaration_statement
5030         : block
5031         | empty_statement
5032         | interactive_expression_statement
5033         | selection_statement
5034         | iteration_statement
5035         | jump_statement
5036         | try_statement
5037         | checked_statement
5038         | unchecked_statement
5039         | lock_statement
5040         | using_statement
5041         | unsafe_statement
5042         | fixed_statement
5043         ;
5044
5045 embedded_statement
5046         : valid_declaration_statement
5047         | block_variable_declaration
5048           {
5049                   report.Error (1023, GetLocation ($1), "An embedded statement may not be a declaration or labeled statement");
5050                   $$ = null;
5051           }
5052         | labeled_statement
5053           {
5054                   report.Error (1023, GetLocation ($1), "An embedded statement may not be a declaration or labeled statement");
5055                   $$ = null;
5056           }
5057         | error
5058           {
5059                 Error_SyntaxError (yyToken);
5060                 $$ = new EmptyStatement (GetLocation ($1));
5061           }
5062         ;
5063
5064 empty_statement
5065         : SEMICOLON
5066           {
5067                 // Uses lexer.Location because semicolon location is not kept in quick mode
5068                 $$ = new EmptyStatement (lexer.Location);
5069           }
5070         ;
5071
5072 labeled_statement
5073         : identifier_inside_body COLON
5074           {
5075                 var lt = (Tokenizer.LocatedToken) $1;
5076                 LabeledStatement labeled = new LabeledStatement (lt.Value, current_block, lt.Location);
5077                 lbag.AddLocation (labeled, GetLocation ($2));
5078                 current_block.AddLabel (labeled);
5079                 current_block.AddStatement (labeled);
5080           }
5081           statement
5082         ;
5083
5084 variable_type
5085         : variable_type_simple
5086         | variable_type_simple rank_specifiers
5087           {
5088                 if ($1 is VarExpr)
5089                         $1 = new SimpleName ("var", ((VarExpr) $1).Location);
5090
5091                 $$ = new ComposedCast ((FullNamedExpression) $1, (ComposedTypeSpecifier) $2);
5092           }
5093         ;
5094
5095 /*
5096  * The following is from Rhys' grammar:
5097  * > Types in local variable declarations must be recognized as
5098  * > expressions to prevent reduce/reduce errors in the grammar.
5099  * > The expressions are converted into types during semantic analysis.
5100  */
5101 variable_type_simple
5102         : primary_expression_or_type opt_nullable
5103           {
5104                 // Ok, the above "primary_expression" is there to get rid of
5105                 // both reduce/reduce and shift/reduces in the grammar, it should
5106                 // really just be "type_name".  If you use type_name, a reduce/reduce
5107                 // creeps up.  If you use namespace_or_type_name (which is all we need
5108                 // really) two shift/reduces appear.
5109                 //
5110
5111                 // So the super-trick is that primary_expression
5112                 // can only be either a SimpleName or a MemberAccess.
5113                 // The MemberAccess case arises when you have a fully qualified type-name like :
5114                 // Foo.Bar.Blah i;
5115                 // SimpleName is when you have
5116                 // Blah i;
5117
5118                 Expression expr = (Expression) $1;
5119                 if ($2 == null) {
5120                         SimpleName sn = expr as SimpleName;
5121                         if (sn != null && sn.Name == "var")
5122                                 $$ = new VarExpr (sn.Location);
5123                         else
5124                                 $$ = $1;
5125                 } else if (expr is ATypeNameExpression) {
5126                         $$ = new ComposedCast ((ATypeNameExpression)expr, (ComposedTypeSpecifier) $2);
5127                 } else {
5128                         Error_ExpectingTypeName (expr);
5129                         $$ = null;
5130                 }
5131           }
5132         | primary_expression_or_type pointer_stars
5133           {
5134                 ATypeNameExpression expr = $1 as ATypeNameExpression;
5135
5136                 if (expr != null) {
5137                         $$ = new ComposedCast (expr, (ComposedTypeSpecifier) $2);
5138                 } else {
5139                         Error_ExpectingTypeName ((Expression)$1);
5140                         $$ = expr;
5141                 }
5142           }
5143         | builtin_types opt_nullable
5144           {
5145                 if ($2 == null)
5146                         $$ = $1;
5147                 else
5148                         $$ = new ComposedCast ((FullNamedExpression) $1, (ComposedTypeSpecifier) $2);
5149           }
5150         | builtin_types pointer_stars
5151           {
5152                 $$ = new ComposedCast ((FullNamedExpression) $1, (ComposedTypeSpecifier) $2);
5153           }
5154         | VOID pointer_stars
5155           {
5156                 $$ = new ComposedCast (new TypeExpression (compiler.BuiltinTypes.Void, GetLocation ($1)), (ComposedTypeSpecifier) $2);
5157           }
5158         | VOID
5159           {
5160                 Expression.Error_VoidInvalidInTheContext (GetLocation ($1), report);
5161                 $$ = new TypeExpression (compiler.BuiltinTypes.Void, GetLocation ($1));
5162           }
5163         ;
5164
5165 pointer_stars
5166         : pointer_star
5167         | pointer_star pointer_stars
5168           {
5169                 ((ComposedTypeSpecifier) $1).Next = (ComposedTypeSpecifier) $2;
5170                 $$ = $1;
5171           }
5172         ;
5173
5174 pointer_star
5175         : STAR
5176           {
5177                 $$ = ComposedTypeSpecifier.CreatePointer (GetLocation ($1));
5178           }
5179         ;
5180
5181 identifier_inside_body
5182         : IDENTIFIER
5183         | AWAIT
5184           {
5185                 $$ = Error_AwaitAsIdentifier ($1);
5186           }
5187         ;
5188
5189 block_variable_declaration
5190         : variable_type identifier_inside_body
5191           {
5192                 var lt = (Tokenizer.LocatedToken) $2;
5193                 var li = new LocalVariable (current_block, lt.Value, lt.Location);
5194                 current_block.AddLocalName (li);
5195                 current_variable = new BlockVariableDeclaration ((FullNamedExpression) $1, li);
5196           }
5197           opt_local_variable_initializer opt_variable_declarators SEMICOLON
5198           {
5199                 $$ = current_variable;
5200                 current_variable = null;
5201                 if ($4 != null)
5202                         lbag.AddLocation ($$, PopLocation (), GetLocation ($6));
5203                 else
5204                         lbag.AddLocation ($$, GetLocation ($6));
5205           }
5206         | CONST variable_type identifier_inside_body
5207           {
5208                 var lt = (Tokenizer.LocatedToken) $3;
5209                 var li = new LocalVariable (current_block, lt.Value, LocalVariable.Flags.Constant, lt.Location);
5210                 current_block.AddLocalName (li);
5211                 current_variable = new BlockConstantDeclaration ((FullNamedExpression) $2, li);
5212           }
5213           const_variable_initializer opt_const_declarators SEMICOLON
5214           {
5215                 $$ = current_variable;
5216                 current_variable = null;
5217                 lbag.AddLocation ($$, GetLocation ($1), GetLocation ($7));
5218           }
5219         ;
5220
5221 opt_local_variable_initializer
5222         : /* empty */
5223         | ASSIGN block_variable_initializer
5224           {
5225                 current_variable.Initializer = (Expression) $2;
5226                 PushLocation (GetLocation ($1));
5227                 $$ = current_variable;
5228           }
5229         | error
5230           {
5231                 if (yyToken == Token.OPEN_BRACKET_EXPR) {
5232                         report.Error (650, lexer.Location,
5233                                 "Syntax error, bad array declarator. To declare a managed array the rank specifier precedes the variable's identifier. To declare a fixed size buffer field, use the fixed keyword before the field type");
5234                 } else {
5235                         Error_SyntaxError (yyToken);
5236                 }
5237           }
5238         ;
5239
5240 opt_variable_declarators
5241         : /* empty */
5242         | variable_declarators
5243         ;
5244
5245 opt_using_or_fixed_variable_declarators
5246         : /* empty */
5247         | variable_declarators
5248           {
5249                 foreach (var d in current_variable.Declarators) {
5250                         if (d.Initializer == null)
5251                                 Error_MissingInitializer (d.Variable.Location);
5252                 }
5253           }
5254         ;
5255
5256 variable_declarators
5257         : variable_declarator
5258         | variable_declarators variable_declarator
5259         ;
5260
5261 variable_declarator
5262         : COMMA identifier_inside_body
5263           {
5264                 var lt = (Tokenizer.LocatedToken) $2;
5265                 var li = new LocalVariable (current_variable.Variable, lt.Value, lt.Location);
5266                 var d = new BlockVariableDeclaration.Declarator (li, null);
5267                 current_variable.AddDeclarator (d);
5268                 current_block.AddLocalName (li);
5269                 lbag.AddLocation (d, GetLocation ($1));
5270           }
5271         | COMMA identifier_inside_body ASSIGN block_variable_initializer
5272           {
5273                 var lt = (Tokenizer.LocatedToken) $2;
5274                 var li = new LocalVariable (current_variable.Variable, lt.Value, lt.Location);
5275                 var d = new BlockVariableDeclaration.Declarator (li, (Expression) $4);
5276                 current_variable.AddDeclarator (d);
5277                 current_block.AddLocalName (li);
5278                 lbag.AddLocation (d, GetLocation ($1), GetLocation ($3));
5279           }
5280         ;
5281
5282 const_variable_initializer
5283         : /* empty */
5284           {
5285                 report.Error (145, lexer.Location, "A const field requires a value to be provided");
5286           }
5287         | ASSIGN constant_initializer_expr
5288           {
5289                 current_variable.Initializer = (Expression) $2;
5290           }
5291         ;
5292
5293 opt_const_declarators
5294         : /* empty */
5295         | const_declarators
5296         ;
5297
5298 const_declarators
5299         : const_declarator
5300         | const_declarators const_declarator
5301         ;
5302
5303 const_declarator
5304         : COMMA identifier_inside_body ASSIGN constant_initializer_expr
5305           {
5306                 var lt = (Tokenizer.LocatedToken) $2;
5307                 var li = new LocalVariable (current_block, lt.Value, LocalVariable.Flags.Constant, lt.Location);
5308                 var d = new BlockVariableDeclaration.Declarator (li, (Expression) $4);
5309                 current_variable.AddDeclarator (d);
5310                 current_block.AddLocalName (li);
5311                 lbag.AddLocation (d, GetLocation ($1), GetLocation ($3));
5312           }
5313         ;
5314
5315 block_variable_initializer
5316         : variable_initializer
5317         | STACKALLOC simple_type OPEN_BRACKET_EXPR expression CLOSE_BRACKET
5318           {
5319                 $$ = new StackAlloc ((Expression) $2, (Expression) $4, GetLocation ($1));
5320                 lbag.AddLocation ($$, GetLocation ($3), GetLocation ($5));
5321           }
5322         | STACKALLOC simple_type
5323           {
5324                 report.Error (1575, GetLocation ($1), "A stackalloc expression requires [] after type");
5325                 $$ = new StackAlloc ((Expression) $2, null, GetLocation ($1));
5326           }
5327         ;
5328
5329 expression_statement
5330         : statement_expression SEMICOLON
5331           {
5332                 $$ = $1;
5333                 lbag.AddStatement ($$, GetLocation ($2));
5334           }
5335         | statement_expression COMPLETE_COMPLETION { $$ = $1; }
5336         | statement_expression CLOSE_BRACE
5337           {
5338                 $$ = $1;
5339                 report.Error (1002, GetLocation ($2), "; expected");
5340                 lexer.putback ('}');
5341           }
5342         ;
5343
5344 interactive_expression_statement
5345         : interactive_statement_expression SEMICOLON { $$ = $1; }
5346         | interactive_statement_expression COMPLETE_COMPLETION { $$ = $1; }
5347         ;
5348
5349         //
5350         // We have to do the wrapping here and not in the case above,
5351         // because statement_expression is used for example in for_statement
5352         //
5353 statement_expression
5354         : expression
5355           {
5356                 ExpressionStatement s = $1 as ExpressionStatement;
5357                 if (s == null) {
5358                         var expr = $1 as Expression;
5359                         expr.Error_InvalidExpressionStatement (report);
5360                         $$ = new StatementErrorExpression (expr);
5361                 } else {
5362                         $$ = new StatementExpression (s);
5363                 }
5364           }
5365         ;
5366
5367 interactive_statement_expression
5368         : expression
5369           {
5370                 Expression expr = (Expression) $1;
5371                 ExpressionStatement s;
5372
5373                 s = new OptionalAssign (new SimpleName ("$retval", lexer.Location), expr, lexer.Location);
5374                 $$ = new StatementExpression (s);
5375           }
5376         | error
5377           {
5378                 Error_SyntaxError (yyToken);
5379                 $$ = new EmptyStatement (GetLocation ($1));
5380           }
5381         ;
5382
5383 selection_statement
5384         : if_statement
5385         | switch_statement
5386         ;
5387
5388 if_statement
5389         : IF open_parens_any boolean_expression CLOSE_PARENS
5390           embedded_statement
5391           {
5392                 if ($5 is EmptyStatement)
5393                         Warning_EmptyStatement (GetLocation ($5));
5394
5395                 $$ = new If ((BooleanExpression) $3, (Statement) $5, GetLocation ($1));
5396                 lbag.AddStatement ($$, GetLocation ($2), GetLocation ($4));
5397           }
5398         | IF open_parens_any boolean_expression CLOSE_PARENS
5399           embedded_statement ELSE embedded_statement
5400           {
5401                 $$ = new If ((BooleanExpression) $3, (Statement) $5, (Statement) $7, GetLocation ($1));
5402                 lbag.AddStatement ($$, GetLocation ($2), GetLocation ($4), GetLocation ($6));
5403
5404                 if ($5 is EmptyStatement)
5405                         Warning_EmptyStatement (GetLocation ($5));
5406                 if ($7 is EmptyStatement)
5407                         Warning_EmptyStatement (GetLocation ($7));
5408           }
5409         | IF open_parens_any boolean_expression error
5410           {
5411                 Error_SyntaxError (yyToken);
5412
5413                 $$ = new If ((BooleanExpression) $3, null, GetLocation ($1));
5414                 lbag.AddStatement ($$, GetLocation ($2));
5415           }
5416         ;
5417
5418 switch_statement
5419         : SWITCH open_parens_any expression CLOSE_PARENS OPEN_BRACE
5420           {
5421                 start_block (GetLocation ($5));
5422           }
5423           opt_switch_sections CLOSE_BRACE
5424           {
5425                 $$ = new Switch ((Expression) $3, (ExplicitBlock) current_block.Explicit, GetLocation ($1));
5426                 end_block (GetLocation ($8));
5427                 lbag.AddStatement ($$, GetLocation ($2), GetLocation ($4));
5428           }
5429         | SWITCH open_parens_any expression error
5430           {
5431                 Error_SyntaxError (yyToken);
5432
5433                 $$ = new Switch ((Expression) $3, null, GetLocation ($1));
5434                 lbag.AddStatement ($$, GetLocation ($2));
5435           }
5436         ;
5437
5438 opt_switch_sections
5439         : /* empty */
5440       {
5441                 report.Warning (1522, 1, current_block.StartLocation, "Empty switch block");
5442           }
5443         | switch_sections
5444         ;
5445
5446 switch_sections
5447         : switch_section
5448         | switch_sections switch_section
5449         | error
5450           {
5451                 Error_SyntaxError (yyToken);
5452           }
5453         ;
5454
5455 switch_section
5456         : switch_labels statement_list
5457         ;
5458
5459 switch_labels
5460         : switch_label
5461           {
5462                 var label = (SwitchLabel) $1;
5463                 label.SectionStart = true;
5464                 current_block.AddStatement (label);
5465           }
5466         | switch_labels switch_label
5467           {
5468                 current_block.AddStatement ((Statement) $2);
5469           }
5470         ;
5471
5472 switch_label
5473         : CASE constant_expression COLON
5474          {
5475                 $$ = new SwitchLabel ((Expression) $2, GetLocation ($1));
5476                 lbag.AddLocation ($$, GetLocation ($3));
5477          }
5478         | CASE constant_expression error
5479           {
5480                 Error_SyntaxError (yyToken);
5481                 $$ = new SwitchLabel ((Expression) $2, GetLocation ($1));
5482           }
5483         | DEFAULT_COLON
5484           {
5485                 $$ = new SwitchLabel (null, GetLocation ($1));
5486           }
5487         ;
5488
5489 iteration_statement
5490         : while_statement
5491         | do_statement
5492         | for_statement
5493         | foreach_statement
5494         ;
5495
5496 while_statement
5497         : WHILE open_parens_any boolean_expression CLOSE_PARENS embedded_statement
5498           {
5499                 if ($5 is EmptyStatement && lexer.peek_token () == Token.OPEN_BRACE)
5500                         Warning_EmptyStatement (GetLocation ($5));
5501
5502                 $$ = new While ((BooleanExpression) $3, (Statement) $5, GetLocation ($1));
5503                 lbag.AddStatement ($$, GetLocation ($2), GetLocation ($4));
5504           }
5505         | WHILE open_parens_any boolean_expression error
5506           {
5507                 Error_SyntaxError (yyToken);
5508
5509                 $$ = new While ((BooleanExpression) $3, null, GetLocation ($1));
5510                 lbag.AddStatement ($$, GetLocation ($2));
5511           }
5512         ;
5513
5514 do_statement
5515         : DO embedded_statement WHILE open_parens_any boolean_expression CLOSE_PARENS SEMICOLON
5516           {
5517                 $$ = new Do ((Statement) $2, (BooleanExpression) $5, GetLocation ($1), GetLocation ($3));
5518                 lbag.AddStatement ($$, GetLocation ($3), GetLocation ($4), GetLocation ($6), GetLocation ($7));
5519           }
5520         | DO embedded_statement error
5521           {
5522                 Error_SyntaxError (yyToken);
5523                 $$ = new Do ((Statement) $2, null, GetLocation ($1), Location.Null);
5524           }
5525         | DO embedded_statement WHILE open_parens_any boolean_expression error
5526           {
5527                 Error_SyntaxError (yyToken);
5528
5529                 $$ = new Do ((Statement) $2, (BooleanExpression) $5, GetLocation ($1), GetLocation ($3));
5530                 lbag.AddStatement ($$, GetLocation ($3), GetLocation ($4));
5531           }
5532         ;
5533
5534 for_statement
5535         : FOR open_parens_any
5536           {
5537                 start_block (GetLocation ($2));
5538                 current_block.IsCompilerGenerated = true;
5539                 For f = new For (GetLocation ($1));
5540                 current_block.AddStatement (f);
5541                 $$ = f;
5542           }
5543           for_statement_cont
5544           {
5545                 $$ = $4;
5546           }
5547         ;
5548
5549 // Has to use be extra rule to recover started block
5550 for_statement_cont
5551         : opt_for_initializer SEMICOLON
5552           {
5553                 ((For) $0).Initializer = (Statement) $1;
5554
5555                 // Pass the "For" object to the iterator_part4
5556                 oob_stack.Push ($0);
5557           }
5558           for_condition_and_iterator_part
5559           embedded_statement
5560           {
5561                 var locations = (Tuple<Location,Location>) $4;
5562                 oob_stack.Pop ();
5563                 if ($5 is EmptyStatement && lexer.peek_token () == Token.OPEN_BRACE)
5564                         Warning_EmptyStatement (GetLocation ($5));
5565
5566                 For f = ((For) $0);
5567                 f.Statement = (Statement) $5;
5568                 lbag.AddStatement (f, current_block.StartLocation, GetLocation ($2), GetLocation (locations.Item1), GetLocation (locations.Item2));
5569
5570                 $$ = end_block (GetLocation ($2));
5571           }
5572         | error
5573           {
5574                 Error_SyntaxError (yyToken);
5575                 $$ = end_block (current_block.StartLocation);
5576           }
5577         ;
5578
5579 for_condition_and_iterator_part
5580         : opt_for_condition SEMICOLON
5581           {
5582                 For f = (For) oob_stack.Peek ();
5583                 f.Condition = (BooleanExpression) $1;
5584           }
5585           for_iterator_part {
5586                 $$ = new Tuple<Location,Location> (GetLocation ($2), (Location) $4);
5587           }
5588
5589         // Handle errors in the case of opt_for_condition being followed by
5590         // a close parenthesis
5591         | opt_for_condition close_parens_close_brace {
5592                 report.Error (1525, GetLocation ($2), "Unexpected symbol `}'");
5593                 For f = (For) oob_stack.Peek ();
5594                 f.Condition = (BooleanExpression) $1;
5595                 $$ = new Tuple<Location,Location> (GetLocation ($2), GetLocation ($2));
5596           }
5597         ;
5598
5599 for_iterator_part
5600         : opt_for_iterator CLOSE_PARENS {
5601                 For f = (For) oob_stack.Peek ();
5602                 f.Iterator = (Statement) $1;
5603                 $$ = GetLocation ($2);
5604           }
5605         | opt_for_iterator CLOSE_BRACE {
5606                 report.Error (1525, GetLocation ($2), "Unexpected symbol expected ')'");
5607                 For f = (For) oob_stack.Peek ();
5608                 f.Iterator = (Statement) $1;
5609                 $$ = GetLocation ($2);
5610           }
5611         ;
5612
5613 close_parens_close_brace
5614         : CLOSE_PARENS
5615         | CLOSE_BRACE { lexer.putback ('}'); }
5616         ;
5617
5618 opt_for_initializer
5619         : /* empty */           { $$ = new EmptyStatement (lexer.Location); }
5620         | for_initializer
5621         ;
5622
5623 for_initializer
5624         : variable_type identifier_inside_body
5625           {
5626                 var lt = (Tokenizer.LocatedToken) $2;
5627                 var li = new LocalVariable (current_block, lt.Value, lt.Location);
5628                 current_block.AddLocalName (li);
5629                 current_variable = new BlockVariableDeclaration ((FullNamedExpression) $1, li);
5630           }
5631           opt_local_variable_initializer opt_variable_declarators
5632           {
5633                 $$ = current_variable;
5634                 if ($4 != null)
5635                         lbag.AddLocation (current_variable, PopLocation ());
5636
5637                 current_variable = null;
5638           }
5639         | statement_expression_list
5640         ;
5641
5642 opt_for_condition
5643         : /* empty */           { $$ = null; }
5644         | boolean_expression
5645         ;
5646
5647 opt_for_iterator
5648         : /* empty */           { $$ = new EmptyStatement (lexer.Location); }
5649         | for_iterator
5650         ;
5651
5652 for_iterator
5653         : statement_expression_list
5654         ;
5655
5656 statement_expression_list
5657         : statement_expression
5658         | statement_expression_list COMMA statement_expression
5659           {
5660                 var sl = $1 as StatementList;
5661                 if (sl == null) {
5662                         sl = new StatementList ((Statement) $1, (Statement) $3);
5663                         lbag.AddStatement (sl, GetLocation ($2));
5664                 } else {
5665                         sl.Add ((Statement) $3);
5666                         lbag.AppendTo (sl, GetLocation ($2));
5667                 }
5668
5669                 $$ = sl;
5670           }
5671         ;
5672
5673 foreach_statement
5674         : FOREACH open_parens_any type error
5675           {
5676                 report.Error (230, GetLocation ($1), "Type and identifier are both required in a foreach statement");
5677
5678                 start_block (GetLocation ($2));
5679                 current_block.IsCompilerGenerated = true;
5680
5681                 Foreach f = new Foreach ((Expression) $3, null, null, null, null, GetLocation ($1));
5682                 current_block.AddStatement (f);
5683
5684                 lbag.AddStatement (f, GetLocation ($2));
5685                 $$ = end_block (GetLocation ($4));
5686           }
5687         | FOREACH open_parens_any type identifier_inside_body error
5688           {
5689                 Error_SyntaxError (yyToken);
5690
5691                 start_block (GetLocation ($2));
5692                 current_block.IsCompilerGenerated = true;
5693
5694                 var lt = (Tokenizer.LocatedToken) $4;
5695                 var li = new LocalVariable (current_block, lt.Value, LocalVariable.Flags.ForeachVariable | LocalVariable.Flags.Used, lt.Location);
5696                 current_block.AddLocalName (li);
5697
5698                 Foreach f = new Foreach ((Expression) $3, li, null, null, null, GetLocation ($1));
5699                 current_block.AddStatement (f);
5700
5701                 lbag.AddStatement (f, GetLocation ($2));
5702                 $$ = end_block (GetLocation ($5));
5703           }
5704         | FOREACH open_parens_any type identifier_inside_body IN expression CLOSE_PARENS
5705           {
5706                 start_block (GetLocation ($2));
5707                 current_block.IsCompilerGenerated = true;
5708
5709                 var lt = (Tokenizer.LocatedToken) $4;
5710                 var li = new LocalVariable (current_block, lt.Value, LocalVariable.Flags.ForeachVariable | LocalVariable.Flags.Used, lt.Location);
5711                 current_block.AddLocalName (li);
5712                 $$ = li;
5713           }
5714           embedded_statement
5715           {
5716                 if ($9 is EmptyStatement && lexer.peek_token () == Token.OPEN_BRACE)
5717                         Warning_EmptyStatement (GetLocation ($9));
5718
5719                 Foreach f = new Foreach ((Expression) $3, (LocalVariable) $8, (Expression) $6, (Statement) $9, current_block, GetLocation ($1));
5720                 lbag.AddStatement (f, GetLocation ($2), GetLocation ($5), GetLocation ($7));
5721                 end_block (GetLocation ($7));
5722
5723                 $$ = f;
5724           }
5725         ;
5726
5727 jump_statement
5728         : break_statement
5729         | continue_statement
5730         | goto_statement
5731         | return_statement
5732         | throw_statement
5733         | yield_statement
5734         ;
5735
5736 break_statement
5737         : BREAK SEMICOLON
5738           {
5739                 $$ = new Break (GetLocation ($1));
5740                 lbag.AddStatement ($$, GetLocation ($2));
5741           }
5742         ;
5743
5744 continue_statement
5745         : CONTINUE SEMICOLON
5746           {
5747                 $$ = new Continue (GetLocation ($1));
5748                 lbag.AddStatement ($$, GetLocation ($2));
5749           }
5750         | CONTINUE error
5751           {
5752                 Error_SyntaxError (yyToken);
5753                 $$ = new Continue (GetLocation ($1));
5754           }
5755         ;
5756
5757 goto_statement
5758         : GOTO identifier_inside_body SEMICOLON
5759           {
5760                 var lt = (Tokenizer.LocatedToken) $2;
5761                 $$ = new Goto (lt.Value, GetLocation ($1));
5762                 lbag.AddStatement ($$, GetLocation ($2), GetLocation ($3));
5763           }
5764         | GOTO CASE constant_expression SEMICOLON
5765           {
5766                 $$ = new GotoCase ((Expression) $3, GetLocation ($1));
5767                 lbag.AddStatement ($$, GetLocation ($2), GetLocation ($4));
5768           }
5769         | GOTO DEFAULT SEMICOLON
5770           {
5771                 $$ = new GotoDefault (GetLocation ($1));
5772                 lbag.AddStatement ($$, GetLocation ($2), GetLocation ($3));
5773           }
5774         ;
5775
5776 return_statement
5777         : RETURN opt_expression SEMICOLON
5778           {
5779                 $$ = new Return ((Expression) $2, GetLocation ($1));
5780                 lbag.AddStatement ($$, GetLocation ($3));
5781           }
5782         | RETURN expression error
5783           {
5784                 Error_SyntaxError (yyToken);
5785                 $$ = new Return ((Expression) $2, GetLocation ($1));
5786           }
5787         | RETURN error
5788           {
5789                 Error_SyntaxError (yyToken);
5790                 $$ = new Return (null, GetLocation ($1));
5791           }
5792         ;
5793
5794 throw_statement
5795         : THROW opt_expression SEMICOLON
5796           {
5797                 $$ = new Throw ((Expression) $2, GetLocation ($1));
5798                 lbag.AddStatement ($$, GetLocation ($3));
5799           }
5800         | THROW error
5801           {
5802                 Error_SyntaxError (yyToken);
5803                 $$ = new Throw (null, GetLocation ($1));
5804           }
5805         ;
5806
5807 yield_statement
5808         : identifier_inside_body RETURN opt_expression SEMICOLON
5809           {
5810                 var lt = (Tokenizer.LocatedToken) $1;
5811                 string s = lt.Value;
5812                 if (s != "yield"){
5813                         report.Error (1003, lt.Location, "; expected");
5814                 } else if ($3 == null) {
5815                         report.Error (1627, GetLocation ($4), "Expression expected after yield return");
5816                 } else if (lang_version == LanguageVersion.ISO_1){
5817                         FeatureIsNotAvailable (lt.Location, "iterators");
5818                 }
5819
5820                 current_block.Explicit.RegisterIteratorYield ();
5821                 $$ = new Yield ((Expression) $3, lt.Location);
5822                 lbag.AddStatement ($$, GetLocation ($2), GetLocation ($4));
5823           }
5824         | identifier_inside_body RETURN expression error
5825           {
5826                 Error_SyntaxError (yyToken);
5827
5828                 var lt = (Tokenizer.LocatedToken) $1;
5829                 string s = lt.Value;
5830                 if (s != "yield"){
5831                         report.Error (1003, lt.Location, "; expected");
5832                 } else if ($3 == null) {
5833                         report.Error (1627, GetLocation ($4), "Expression expected after yield return");
5834                 } else if (lang_version == LanguageVersion.ISO_1){
5835                         FeatureIsNotAvailable (lt.Location, "iterators");
5836                 }
5837
5838                 current_block.Explicit.RegisterIteratorYield ();
5839                 $$ = new Yield ((Expression) $3, lt.Location);
5840                 lbag.AddStatement ($$, GetLocation ($2));
5841           }
5842         | identifier_inside_body BREAK SEMICOLON
5843           {
5844                 var lt = (Tokenizer.LocatedToken) $1;
5845                 string s = lt.Value;
5846                 if (s != "yield"){
5847                         report.Error (1003, lt.Location, "; expected");
5848                 } else if (lang_version == LanguageVersion.ISO_1){
5849                         FeatureIsNotAvailable (lt.Location, "iterators");
5850                 }
5851
5852                 current_block.Explicit.RegisterIteratorYield ();
5853                 $$ = new YieldBreak (lt.Location);
5854                 lbag.AddStatement ($$, GetLocation ($2), GetLocation ($3));
5855           }
5856         ;
5857
5858 opt_expression
5859         : /* empty */
5860         | expression
5861         ;
5862
5863 try_statement
5864         : TRY block catch_clauses
5865           {
5866                 $$ = new TryCatch ((Block) $2, (List<Catch>) $3, GetLocation ($1), false);
5867           }
5868         | TRY block FINALLY block
5869           {
5870                 $$ = new TryFinally ((Statement) $2, (Block) $4, GetLocation ($1));
5871                 lbag.AddStatement ($$, GetLocation ($3));
5872           }
5873         | TRY block catch_clauses FINALLY block
5874           {
5875                 $$ = new TryFinally (new TryCatch ((Block) $2, (List<Catch>) $3, Location.Null, true), (Block) $5, GetLocation ($1));
5876                 lbag.AddStatement ($$, GetLocation ($4));
5877           }
5878         | TRY block error
5879           {
5880                 Error_SyntaxError (1524, yyToken);
5881                 $$ = new TryCatch ((Block) $2, null, GetLocation ($1), false);
5882           }
5883         ;
5884
5885 catch_clauses
5886         : catch_clause
5887           {
5888                 var l = new List<Catch> (2);
5889
5890                 l.Add ((Catch) $1);
5891                 $$ = l;
5892           }
5893         | catch_clauses catch_clause
5894           {
5895                 var l = (List<Catch>) $1;
5896
5897                 Catch c = (Catch) $2;
5898                 if (l [l.Count - 1].IsGeneral) {
5899                         report.Error (1017, c.loc, "Try statement already has an empty catch block");
5900                 }
5901
5902                 l.Add (c);
5903                 $$ = l;
5904           }
5905         ;
5906
5907 opt_identifier
5908         : /* empty */
5909         | identifier_inside_body
5910         ;
5911
5912 catch_clause
5913         : CATCH block
5914           {
5915                 $$ = new Catch ((Block) $2, GetLocation ($1));
5916           }
5917         | CATCH open_parens_any type opt_identifier CLOSE_PARENS
5918           {
5919                 start_block (GetLocation ($2));
5920                 var c = new Catch (current_block, GetLocation ($1));
5921                 c.TypeExpression = (FullNamedExpression) $3;
5922
5923                 if ($4 != null) {
5924                         var lt = (Tokenizer.LocatedToken) $4;
5925                         c.Variable = new LocalVariable (current_block, lt.Value, lt.Location);
5926                         current_block.AddLocalName (c.Variable);
5927                 }
5928
5929                 lbag.AddLocation (c, GetLocation ($2), GetLocation ($5));
5930                 $$ = c;
5931           }
5932           block_prepared
5933           {
5934                 $$ = $6;
5935           }
5936         | CATCH open_parens_any error
5937           {
5938                 if (yyToken == Token.CLOSE_PARENS) {
5939                         report.Error (1015, lexer.Location,
5940                                 "A type that derives from `System.Exception', `object', or `string' expected");
5941                 } else {
5942                         Error_SyntaxError (yyToken);
5943                 }
5944
5945                 $$ = new Catch (null, GetLocation ($1));
5946           }
5947         | CATCH open_parens_any type opt_identifier CLOSE_PARENS error
5948           {
5949                 Error_SyntaxError (yyToken);
5950
5951                 // Required otherwise missing block could not be detected because
5952                 // start_block is run early
5953                 var c = new Catch (null, GetLocation ($1));
5954                 c.TypeExpression = (FullNamedExpression) $3;
5955
5956                 if ($4 != null) {
5957                         var lt = (Tokenizer.LocatedToken) $4;
5958                         c.Variable = new LocalVariable (current_block, lt.Value, lt.Location);
5959                 }
5960
5961                 lbag.AddLocation (c, GetLocation ($2), GetLocation ($5));
5962
5963                 $$ = c;
5964           }
5965         ;
5966
5967 checked_statement
5968         : CHECKED block
5969           {
5970                 $$ = new Checked ((Block) $2, GetLocation ($1));
5971           }
5972         ;
5973
5974 unchecked_statement
5975         : UNCHECKED block
5976           {
5977                 $$ = new Unchecked ((Block) $2, GetLocation ($1));
5978           }
5979         ;
5980
5981 unsafe_statement
5982         : UNSAFE
5983           {
5984                 if (!settings.Unsafe)
5985                         Error_UnsafeCodeNotAllowed (GetLocation ($1));
5986           } block {
5987                 $$ = new Unsafe ((Block) $3, GetLocation ($1));
5988           }
5989         ;
5990
5991 lock_statement
5992         : LOCK open_parens_any expression CLOSE_PARENS embedded_statement
5993           {
5994                 if ($5 is EmptyStatement && lexer.peek_token () == Token.OPEN_BRACE)
5995                         Warning_EmptyStatement (GetLocation ($5));
5996
5997                 $$ = new Lock ((Expression) $3, (Statement) $5, GetLocation ($1));
5998                 lbag.AddStatement ($$, GetLocation ($2), GetLocation ($4));
5999           }
6000         | LOCK open_parens_any expression error
6001           {
6002                 Error_SyntaxError (yyToken);
6003
6004                 $$ = new Lock ((Expression) $3, null, GetLocation ($1));
6005                 lbag.AddStatement ($$, GetLocation ($2));
6006           }
6007         ;
6008
6009 fixed_statement
6010         : FIXED open_parens_any variable_type identifier_inside_body
6011           {
6012             start_block (GetLocation ($2));
6013
6014                 current_block.IsCompilerGenerated = true;
6015                 var lt = (Tokenizer.LocatedToken) $4;
6016                 var li = new LocalVariable (current_block, lt.Value, LocalVariable.Flags.FixedVariable | LocalVariable.Flags.Used, lt.Location);
6017                 current_block.AddLocalName (li);
6018                 current_variable = new Fixed.VariableDeclaration ((FullNamedExpression) $3, li);
6019           }
6020           using_or_fixed_variable_initializer opt_using_or_fixed_variable_declarators CLOSE_PARENS
6021           {
6022                 $$ = current_variable;
6023                 current_variable = null;
6024           }
6025           embedded_statement
6026           {
6027                 if ($10 is EmptyStatement && lexer.peek_token () == Token.OPEN_BRACE)
6028                         Warning_EmptyStatement (GetLocation ($10));
6029
6030                 Fixed f = new Fixed ((Fixed.VariableDeclaration) $9, (Statement) $10, GetLocation ($1));
6031                 current_block.AddStatement (f);
6032                 $$ = end_block (GetLocation ($8));
6033           }
6034         ;
6035
6036 using_statement
6037         : USING open_parens_any variable_type identifier_inside_body
6038           {
6039             start_block (GetLocation ($2));
6040
6041                 current_block.IsCompilerGenerated = true;
6042                 var lt = (Tokenizer.LocatedToken) $4;
6043                 var li = new LocalVariable (current_block, lt.Value, LocalVariable.Flags.UsingVariable | LocalVariable.Flags.Used, lt.Location);
6044                 current_block.AddLocalName (li);
6045                 current_variable = new Using.VariableDeclaration ((FullNamedExpression) $3, li);
6046           }
6047           using_initialization CLOSE_PARENS
6048           {
6049                 $$ = current_variable;
6050                 current_variable = null;
6051           }
6052           embedded_statement
6053           {
6054                 if ($9 is EmptyStatement && lexer.peek_token () == Token.OPEN_BRACE)
6055                         Warning_EmptyStatement (GetLocation ($9));
6056
6057                 Using u = new Using ((Using.VariableDeclaration) $8, (Statement) $9, GetLocation ($1));
6058                 current_block.AddStatement (u);
6059                 $$ = end_block (GetLocation ($7));
6060           }
6061         | USING open_parens_any expression CLOSE_PARENS embedded_statement
6062           {
6063                 if ($5 is EmptyStatement && lexer.peek_token () == Token.OPEN_BRACE)
6064                         Warning_EmptyStatement (GetLocation ($5));
6065
6066                 $$ = new Using ((Expression) $3, (Statement) $5, GetLocation ($1));
6067                 lbag.AddStatement ($$, GetLocation ($2), GetLocation ($4));
6068           }
6069         | USING open_parens_any expression error
6070           {
6071                 Error_SyntaxError (yyToken);
6072
6073                 $$ = new Using ((Expression) $3, null, GetLocation ($1));
6074                 lbag.AddStatement ($$, GetLocation ($2));
6075           }
6076         ;
6077
6078 using_initialization
6079         : using_or_fixed_variable_initializer opt_using_or_fixed_variable_declarators
6080         | error
6081           {
6082                 // It has to be here for the parent to safely restore artificial block
6083                 Error_SyntaxError (yyToken);
6084           }
6085         ;
6086
6087 using_or_fixed_variable_initializer
6088         : /* empty */
6089           {
6090                 Error_MissingInitializer (lexer.Location);
6091           }
6092         | ASSIGN variable_initializer
6093           {
6094                 current_variable.Initializer = (Expression) $2;
6095                 $$ = current_variable;
6096           }
6097         ;
6098
6099
6100 // LINQ
6101
6102 query_expression
6103         : first_from_clause query_body
6104           {
6105                 lexer.query_parsing = false;
6106
6107                 Linq.AQueryClause from = $1 as Linq.AQueryClause;
6108
6109                 from.Tail.Next = (Linq.AQueryClause)$2;
6110                 $$ = from;
6111
6112                 current_block.SetEndLocation (lexer.Location);
6113                 current_block = current_block.Parent;
6114           }
6115         | nested_from_clause query_body
6116           {
6117                 Linq.AQueryClause from = $1 as Linq.AQueryClause;
6118
6119                 from.Tail.Next = (Linq.AQueryClause)$2;
6120                 $$ = from;
6121
6122                 current_block.SetEndLocation (lexer.Location);
6123                 current_block = current_block.Parent;
6124           }
6125
6126         // Bubble up COMPLETE_COMPLETION productions
6127         | first_from_clause COMPLETE_COMPLETION {
6128                 lexer.query_parsing = false;
6129                 $$ = $1;
6130
6131                 current_block.SetEndLocation (lexer.Location);
6132                 current_block = current_block.Parent;
6133           }
6134         | nested_from_clause COMPLETE_COMPLETION {
6135                 $$ = $1;
6136                 current_block.SetEndLocation (lexer.Location);
6137                 current_block = current_block.Parent;
6138           }
6139         ;
6140
6141 first_from_clause
6142         : FROM_FIRST identifier_inside_body IN expression
6143           {
6144                 current_block = new Linq.QueryBlock (current_block, lexer.Location);
6145
6146                 var lt = (Tokenizer.LocatedToken) $2;
6147                 var rv = new Linq.RangeVariable (lt.Value, lt.Location);
6148                 $$ = new Linq.QueryExpression (new Linq.QueryStartClause ((Linq.QueryBlock)current_block, (Expression)$4, rv, GetLocation ($1)));
6149           }
6150         | FROM_FIRST type identifier_inside_body IN expression
6151           {
6152                 current_block = new Linq.QueryBlock (current_block, lexer.Location);
6153
6154                 var lt = (Tokenizer.LocatedToken) $3;
6155                 var rv = new Linq.RangeVariable (lt.Value, lt.Location);
6156                 $$ = new Linq.QueryExpression (
6157                         new Linq.QueryStartClause ((Linq.QueryBlock)current_block, (Expression)$5, rv, GetLocation ($1)) {
6158                                 IdentifierType = (FullNamedExpression)$2
6159                         }
6160                 );
6161           }
6162         ;
6163
6164 nested_from_clause
6165         : FROM identifier_inside_body IN expression
6166           {
6167                 current_block = new Linq.QueryBlock (current_block, lexer.Location);
6168
6169                 var lt = (Tokenizer.LocatedToken) $2;
6170                 var rv = new Linq.RangeVariable (lt.Value, lt.Location);
6171                 $$ = new Linq.QueryExpression (new Linq.QueryStartClause ((Linq.QueryBlock)current_block, (Expression)$4, rv, GetLocation ($1)));
6172           }
6173         | FROM type identifier_inside_body IN expression
6174           {
6175                 current_block = new Linq.QueryBlock (current_block, lexer.Location);
6176
6177                 var lt = (Tokenizer.LocatedToken) $3;
6178                 var rv = new Linq.RangeVariable (lt.Value, lt.Location);
6179                 $$ = new Linq.QueryExpression (
6180                         new Linq.QueryStartClause ((Linq.QueryBlock)current_block, (Expression)$5, rv, GetLocation ($1)) {
6181                                 IdentifierType = (FullNamedExpression)$2
6182                         }
6183                 );
6184           }
6185         ;
6186
6187 from_clause
6188         : FROM identifier_inside_body IN
6189           {
6190                 current_block = new Linq.QueryBlock (current_block, lexer.Location);
6191           }
6192           expression_or_error
6193           {
6194                 var lt = (Tokenizer.LocatedToken) $2;
6195                 var sn = new Linq.RangeVariable (lt.Value, lt.Location);
6196                 $$ = new Linq.SelectMany ((Linq.QueryBlock)current_block, sn, (Expression)$5, GetLocation ($1));
6197
6198                 current_block.SetEndLocation (lexer.Location);
6199                 current_block = current_block.Parent;
6200
6201                 ((Linq.QueryBlock)current_block).AddRangeVariable (sn);
6202           }
6203         | FROM type identifier_inside_body IN
6204           {
6205                 current_block = new Linq.QueryBlock (current_block, lexer.Location);
6206           }
6207           expression_or_error
6208           {
6209                 var lt = (Tokenizer.LocatedToken) $3;
6210                 var sn = new Linq.RangeVariable (lt.Value, lt.Location);
6211
6212                 $$ = new Linq.SelectMany ((Linq.QueryBlock)current_block, sn, (Expression)$6, GetLocation ($1)) {
6213                         IdentifierType = (FullNamedExpression)$2
6214                 };
6215
6216                 current_block.SetEndLocation (lexer.Location);
6217                 current_block = current_block.Parent;
6218
6219                 ((Linq.QueryBlock)current_block).AddRangeVariable (sn);
6220           }
6221         ;
6222
6223 query_body
6224         : query_body_clauses select_or_group_clause opt_query_continuation
6225           {
6226                 Linq.AQueryClause head = (Linq.AQueryClause)$2;
6227
6228                 if ($3 != null)
6229                         head.Next = (Linq.AQueryClause)$3;
6230
6231                 if ($1 != null) {
6232                         Linq.AQueryClause clause = (Linq.AQueryClause)$1;
6233                         clause.Tail.Next = head;
6234                         head = clause;
6235                 }
6236
6237                 $$ = head;
6238           }
6239         | select_or_group_clause opt_query_continuation
6240           {
6241                 Linq.AQueryClause head = (Linq.AQueryClause)$2;
6242
6243                 if ($1 != null) {
6244                         Linq.AQueryClause clause = (Linq.AQueryClause)$1;
6245                         clause.Tail.Next = head;
6246                         head = clause;
6247                 }
6248
6249                 $$ = head;
6250           }
6251         | query_body_clauses COMPLETE_COMPLETION
6252         | query_body_clauses error
6253           {
6254                 report.Error (742, GetLocation ($2), "Unexpected symbol `{0}'. A query body must end with select or group clause", GetSymbolName (yyToken));
6255                 $$ = $1;
6256           }
6257         | error
6258           {
6259                 Error_SyntaxError (yyToken);
6260                 $$ = null;
6261           }
6262         ;
6263
6264 select_or_group_clause
6265         : SELECT
6266           {
6267                 current_block = new Linq.QueryBlock (current_block, lexer.Location);
6268           }
6269           expression_or_error
6270           {
6271                 $$ = new Linq.Select ((Linq.QueryBlock)current_block, (Expression)$3, GetLocation ($1));
6272
6273                 current_block.SetEndLocation (lexer.Location);
6274                 current_block = current_block.Parent;
6275           }
6276         | GROUP
6277           {
6278                 if (linq_clause_blocks == null)
6279                         linq_clause_blocks = new Stack<Linq.QueryBlock> ();
6280
6281                 current_block = new Linq.QueryBlock (current_block, lexer.Location);
6282                 linq_clause_blocks.Push ((Linq.QueryBlock)current_block);
6283           }
6284           expression_or_error
6285           {
6286                 current_block.SetEndLocation (lexer.Location);
6287                 current_block = current_block.Parent;
6288
6289                 current_block = new Linq.QueryBlock (current_block, lexer.Location);
6290           }
6291           by_expression
6292           {
6293                 var obj = (object[]) $5;
6294
6295                 $$ = new Linq.GroupBy ((Linq.QueryBlock)current_block, (Expression)$3, linq_clause_blocks.Pop (), (Expression)obj[0], GetLocation ($1));
6296                 lbag.AddLocation ($$, (Location) obj[1]);
6297
6298                 current_block.SetEndLocation (lexer.Location);
6299                 current_block = current_block.Parent;
6300           }
6301         ;
6302
6303 by_expression
6304         : BY expression_or_error
6305           {
6306                 $$ = new object[] { $2, GetLocation ($1) };
6307           }
6308         | error
6309           {
6310                 Error_SyntaxError (yyToken);
6311                 $$ = new object[2] { null, Location.Null };
6312           }
6313         ;
6314
6315 query_body_clauses
6316         : query_body_clause
6317         | query_body_clauses query_body_clause
6318           {
6319                 ((Linq.AQueryClause)$1).Tail.Next = (Linq.AQueryClause)$2;
6320                 $$ = $1;
6321           }
6322         ;
6323
6324 query_body_clause
6325         : from_clause
6326         | let_clause
6327         | where_clause
6328         | join_clause
6329         | orderby_clause
6330         ;
6331
6332 let_clause
6333         : LET identifier_inside_body ASSIGN
6334           {
6335                 current_block = new Linq.QueryBlock (current_block, lexer.Location);
6336           }
6337           expression_or_error
6338           {
6339                 var lt = (Tokenizer.LocatedToken) $2;
6340                 var sn = new Linq.RangeVariable (lt.Value, lt.Location);
6341                 $$ = new Linq.Let ((Linq.QueryBlock) current_block, sn, (Expression)$5, GetLocation ($1));
6342                 lbag.AddLocation ($$, GetLocation ($3));
6343
6344                 current_block.SetEndLocation (lexer.Location);
6345                 current_block = current_block.Parent;
6346
6347                 ((Linq.QueryBlock)current_block).AddRangeVariable (sn);
6348           }
6349         ;
6350
6351 where_clause
6352         : WHERE
6353           {
6354                 current_block = new Linq.QueryBlock (current_block, lexer.Location);
6355           }
6356           expression_or_error
6357           {
6358                 $$ = new Linq.Where ((Linq.QueryBlock)current_block, (Expression)$3, GetLocation ($1));
6359
6360                 current_block.SetEndLocation (lexer.Location);
6361                 current_block = current_block.Parent;
6362           }
6363         ;
6364
6365 join_clause
6366         : JOIN identifier_inside_body IN
6367           {
6368                 if (linq_clause_blocks == null)
6369                         linq_clause_blocks = new Stack<Linq.QueryBlock> ();
6370
6371                 current_block = new Linq.QueryBlock (current_block, lexer.Location);
6372                 linq_clause_blocks.Push ((Linq.QueryBlock) current_block);
6373           }
6374           expression_or_error ON
6375           {
6376                 current_block.SetEndLocation (lexer.Location);
6377                 current_block = current_block.Parent;
6378
6379                 current_block = new Linq.QueryBlock (current_block, lexer.Location);
6380                 linq_clause_blocks.Push ((Linq.QueryBlock) current_block);
6381           }
6382           expression_or_error EQUALS
6383           {
6384                 current_block.AddStatement (new ContextualReturn ((Expression) $8));
6385                 current_block.SetEndLocation (lexer.Location);
6386                 current_block = current_block.Parent;
6387
6388                 current_block = new Linq.QueryBlock (current_block, lexer.Location);
6389           }
6390           expression_or_error opt_join_into
6391           {
6392                 current_block.AddStatement (new ContextualReturn ((Expression) $11));
6393                 current_block.SetEndLocation (lexer.Location);
6394
6395                 var outer_selector = linq_clause_blocks.Pop ();
6396                 var block = linq_clause_blocks.Pop ();
6397
6398                 var lt = (Tokenizer.LocatedToken) $2;
6399                 var sn = new Linq.RangeVariable (lt.Value, lt.Location);
6400                 Linq.RangeVariable into;
6401
6402                 if ($12 == null) {
6403                         into = sn;
6404                         $$ = new Linq.Join (block, sn, (Expression)$5, outer_selector, (Linq.QueryBlock) current_block, GetLocation ($1));
6405                         lbag.AddLocation ($$, GetLocation ($3), GetLocation ($6), GetLocation ($9));
6406                 } else {
6407                         //
6408                         // Set equals right side parent to beginning of linq query, it is not accessible therefore cannot cause name collisions
6409                         //
6410                         var parent = block.Parent;
6411                         while (parent is Linq.QueryBlock) {
6412                                 parent = parent.Parent;
6413                         }
6414                         current_block.Parent = parent;
6415
6416                         ((Linq.QueryBlock)current_block).AddRangeVariable (sn);
6417
6418                         lt = (Tokenizer.LocatedToken) $12;
6419                         into = new Linq.RangeVariable (lt.Value, lt.Location);
6420
6421                         $$ = new Linq.GroupJoin (block, sn, (Expression)$5, outer_selector, (Linq.QueryBlock) current_block, into, GetLocation ($1));
6422                         lbag.AddLocation ($$, GetLocation ($3), GetLocation ($6), GetLocation ($9), GetLocation ($12));
6423                 }
6424
6425                 current_block = block.Parent;
6426                 ((Linq.QueryBlock)current_block).AddRangeVariable (into);
6427           }
6428         | JOIN type identifier_inside_body IN
6429           {
6430                 if (linq_clause_blocks == null)
6431                         linq_clause_blocks = new Stack<Linq.QueryBlock> ();
6432
6433                 current_block = new Linq.QueryBlock (current_block, lexer.Location);
6434                 linq_clause_blocks.Push ((Linq.QueryBlock) current_block);
6435           }
6436           expression_or_error ON
6437           {
6438                 current_block.SetEndLocation (lexer.Location);
6439                 current_block = current_block.Parent;
6440
6441                 current_block = new Linq.QueryBlock (current_block, lexer.Location);
6442                 linq_clause_blocks.Push ((Linq.QueryBlock) current_block);
6443           }
6444           expression_or_error EQUALS
6445           {
6446                 current_block.AddStatement (new ContextualReturn ((Expression) $9));
6447                 current_block.SetEndLocation (lexer.Location);
6448                 current_block = current_block.Parent;
6449
6450                 current_block = new Linq.QueryBlock (current_block, lexer.Location);
6451           }
6452           expression_or_error opt_join_into
6453           {
6454                 current_block.AddStatement (new ContextualReturn ((Expression) $12));
6455                 current_block.SetEndLocation (lexer.Location);
6456
6457                 var outer_selector = linq_clause_blocks.Pop ();
6458                 var block = linq_clause_blocks.Pop ();
6459
6460                 var lt = (Tokenizer.LocatedToken) $3;
6461                 var sn = new Linq.RangeVariable (lt.Value, lt.Location);
6462                 Linq.RangeVariable into;
6463
6464                 if ($13 == null) {
6465                         into = sn;
6466                         $$ = new Linq.Join (block, sn, (Expression)$6, outer_selector, (Linq.QueryBlock) current_block, GetLocation ($1)) {
6467                                 IdentifierType = (FullNamedExpression)$2
6468                         };
6469                 } else {
6470                         //
6471                         // Set equals right side parent to beginning of linq query, it is not accessible therefore cannot cause name collisions
6472                         //
6473                         var parent = block.Parent;
6474                         while (parent is Linq.QueryBlock) {
6475                                 parent = parent.Parent;
6476                         }
6477                         current_block.Parent = parent;
6478
6479                         ((Linq.QueryBlock)current_block).AddRangeVariable (sn);
6480
6481                         lt = (Tokenizer.LocatedToken) $13;
6482                         into = new Linq.RangeVariable (lt.Value, lt.Location); // TODO:
6483
6484                         $$ = new Linq.GroupJoin (block, sn, (Expression)$6, outer_selector, (Linq.QueryBlock) current_block, into, GetLocation ($1)) {
6485                                 IdentifierType = (FullNamedExpression)$2
6486                         };
6487                 }
6488
6489                 current_block = block.Parent;
6490                 ((Linq.QueryBlock)current_block).AddRangeVariable (into);
6491           }
6492         ;
6493
6494 opt_join_into
6495         : /* empty */
6496         | INTO identifier_inside_body
6497           {
6498                 $$ = $2;
6499           }
6500         ;
6501
6502 orderby_clause
6503         : ORDERBY
6504           {
6505                 current_block = new Linq.QueryBlock (current_block, lexer.Location);
6506           }
6507           orderings
6508           {
6509                 current_block.SetEndLocation (lexer.Location);
6510                 current_block = current_block.Parent;
6511
6512                 $$ = $3;
6513           }
6514         ;
6515
6516 orderings
6517         : order_by
6518         | order_by COMMA
6519           {
6520                 current_block.SetEndLocation (lexer.Location);
6521                 current_block = current_block.Parent;
6522
6523                 current_block = new Linq.QueryBlock (current_block, lexer.Location);
6524           }
6525           orderings_then_by
6526           {
6527                 ((Linq.AQueryClause)$1).Next = (Linq.AQueryClause)$4;
6528                 $$ = $1;
6529           }
6530         ;
6531
6532 orderings_then_by
6533         : then_by
6534         | orderings_then_by COMMA
6535          {
6536                 current_block.SetEndLocation (lexer.Location);
6537                 current_block = current_block.Parent;
6538
6539                 current_block = new Linq.QueryBlock ((Linq.QueryBlock) current_block, lexer.Location);
6540          }
6541          then_by
6542          {
6543                 ((Linq.AQueryClause)$1).Tail.Next = (Linq.AQueryClause)$4;
6544                 $$ = $1;
6545          }
6546         ;
6547
6548 order_by
6549         : expression
6550           {
6551                 $$ = new Linq.OrderByAscending ((Linq.QueryBlock) current_block, (Expression)$1);
6552           }
6553         | expression ASCENDING
6554           {
6555                 $$ = new Linq.OrderByAscending ((Linq.QueryBlock) current_block, (Expression)$1);
6556                 lbag.AddLocation ($$, GetLocation ($2));
6557           }
6558         | expression DESCENDING
6559           {
6560                 $$ = new Linq.OrderByDescending ((Linq.QueryBlock) current_block, (Expression)$1);
6561                 lbag.AddLocation ($$, GetLocation ($2));
6562           }
6563         ;
6564
6565 then_by
6566         : expression
6567           {
6568                 $$ = new Linq.ThenByAscending ((Linq.QueryBlock) current_block, (Expression)$1);
6569           }
6570         | expression ASCENDING
6571           {
6572                 $$ = new Linq.ThenByAscending ((Linq.QueryBlock) current_block, (Expression)$1);
6573                 lbag.AddLocation ($$, GetLocation ($2));
6574           }
6575         | expression DESCENDING
6576           {
6577                 $$ = new Linq.ThenByDescending ((Linq.QueryBlock) current_block, (Expression)$1);
6578                 lbag.AddLocation ($$, GetLocation ($2));
6579           }
6580         ;
6581
6582
6583 opt_query_continuation
6584         : /* empty */
6585         | INTO identifier_inside_body
6586           {
6587                 // query continuation block is not linked with query block but with block
6588                 // before. This means each query can use same range variable names for
6589                 // different identifiers.
6590
6591                 current_block.SetEndLocation (GetLocation ($1));
6592                 current_block = current_block.Parent;
6593
6594                 current_block = new Linq.QueryBlock (current_block, lexer.Location);
6595
6596                 if (linq_clause_blocks == null)
6597                         linq_clause_blocks = new Stack<Linq.QueryBlock> ();
6598
6599                 linq_clause_blocks.Push ((Linq.QueryBlock) current_block);
6600           }
6601           query_body
6602           {
6603                 var current_block = linq_clause_blocks.Pop ();
6604                 var lt = (Tokenizer.LocatedToken) $2;
6605                 var rv = new Linq.RangeVariable (lt.Value, lt.Location);
6606                 $$ = new Linq.QueryStartClause ((Linq.QueryBlock)current_block, null, rv, GetLocation ($1)) {
6607                         next = (Linq.AQueryClause)$4
6608                 };
6609           }
6610         ;
6611
6612 //
6613 // Support for using the compiler as an interactive parser
6614 //
6615 // The INTERACTIVE_PARSER token is first sent to parse our
6616 // productions;  If the result is a Statement, the parsing
6617 // is repeated, this time with INTERACTIVE_PARSE_WITH_BLOCK
6618 // to setup the blocks in advance.
6619 //
6620 // This setup is here so that in the future we can add
6621 // support for other constructs (type parsing, namespaces, etc)
6622 // that do not require a block to be setup in advance
6623 //
6624
6625 interactive_parsing
6626         : EVAL_STATEMENT_PARSER EOF
6627         | EVAL_USING_DECLARATIONS_UNIT_PARSER using_directives opt_COMPLETE_COMPLETION
6628         | EVAL_STATEMENT_PARSER
6629          {
6630                 current_container = current_type = new Class (current_container, new MemberName ("<InteractiveExpressionClass>"), Modifiers.PUBLIC, null);
6631
6632                 // (ref object retval)
6633                 Parameter [] mpar = new Parameter [1];
6634                 mpar [0] = new Parameter (new TypeExpression (compiler.BuiltinTypes.Object, Location.Null), "$retval", Parameter.Modifier.REF, null, Location.Null);
6635
6636                 ParametersCompiled pars = new ParametersCompiled (mpar);
6637                 var mods = Modifiers.PUBLIC | Modifiers.STATIC;
6638                 if (settings.Unsafe)
6639                         mods |= Modifiers.UNSAFE;
6640
6641                 current_local_parameters = pars;
6642                 Method method = new Method (
6643                         current_type,
6644                         new TypeExpression (compiler.BuiltinTypes.Void, Location.Null),
6645                         mods,
6646                         new MemberName ("Host"),
6647                         pars,
6648                         null /* attributes */);
6649
6650                 current_type.AddMember (method);
6651
6652                 oob_stack.Push (method);
6653                 ++lexer.parsing_block;
6654                 start_block (lexer.Location);
6655           }
6656           interactive_statement_list opt_COMPLETE_COMPLETION
6657           {
6658                 --lexer.parsing_block;
6659                 Method method = (Method) oob_stack.Pop ();
6660
6661                 method.Block = (ToplevelBlock) end_block(lexer.Location);
6662
6663                 InteractiveResult = (Class) pop_current_class ();
6664                 current_local_parameters = null;
6665           }
6666         | EVAL_COMPILATION_UNIT_PARSER interactive_compilation_unit
6667         ;
6668
6669 interactive_compilation_unit
6670         : opt_extern_alias_directives opt_using_directives
6671         | opt_extern_alias_directives opt_using_directives namespace_or_type_declarations
6672         ;
6673
6674 opt_COMPLETE_COMPLETION
6675         : /* nothing */
6676         | COMPLETE_COMPLETION
6677         ;
6678
6679 close_brace_or_complete_completion
6680         : CLOSE_BRACE
6681         | COMPLETE_COMPLETION
6682         ;
6683
6684 //
6685 // XML documentation code references micro parser
6686 //
6687 documentation_parsing
6688         : DOC_SEE doc_cref
6689           {
6690                 module.DocumentationBuilder.ParsedName = (MemberName) $2;
6691           }
6692         ;
6693
6694 doc_cref
6695         : doc_type_declaration_name opt_doc_method_sig
6696           {
6697                 module.DocumentationBuilder.ParsedParameters = (List<DocumentationParameter>)$2;
6698           }
6699         | builtin_types opt_doc_method_sig
6700           {
6701                 module.DocumentationBuilder.ParsedBuiltinType = (TypeExpression)$1;
6702                 module.DocumentationBuilder.ParsedParameters = (List<DocumentationParameter>)$2;
6703                 $$ = null;
6704           }
6705         | builtin_types DOT IDENTIFIER opt_doc_method_sig
6706           {
6707                 module.DocumentationBuilder.ParsedBuiltinType = (TypeExpression)$1;
6708                 module.DocumentationBuilder.ParsedParameters = (List<DocumentationParameter>)$4;
6709                 var lt = (Tokenizer.LocatedToken) $3;
6710                 $$ = new MemberName (lt.Value);
6711           }
6712         | doc_type_declaration_name DOT THIS
6713           {
6714                 $$ = new MemberName ((MemberName) $1, MemberCache.IndexerNameAlias, Location.Null);
6715           }
6716         | doc_type_declaration_name DOT THIS OPEN_BRACKET
6717           {
6718                 valid_param_mod = ParameterModifierType.Ref | ParameterModifierType.Out;
6719           }
6720           opt_doc_parameters CLOSE_BRACKET
6721           {
6722                 module.DocumentationBuilder.ParsedParameters = (List<DocumentationParameter>)$6;
6723                 $$ = new MemberName ((MemberName) $1, MemberCache.IndexerNameAlias, Location.Null);
6724           }
6725         | EXPLICIT OPERATOR type opt_doc_method_sig
6726           {
6727                 var p = (List<DocumentationParameter>)$4 ?? new List<DocumentationParameter> (1);
6728                 p.Add (new DocumentationParameter ((FullNamedExpression) $3));
6729                 module.DocumentationBuilder.ParsedParameters = p;
6730                 module.DocumentationBuilder.ParsedOperator = Operator.OpType.Explicit;
6731                 $$ = null;
6732           }
6733         | IMPLICIT OPERATOR type opt_doc_method_sig
6734           {
6735                 var p = (List<DocumentationParameter>)$4 ?? new List<DocumentationParameter> (1);
6736                 p.Add (new DocumentationParameter ((FullNamedExpression) $3));
6737                 module.DocumentationBuilder.ParsedParameters = p;
6738                 module.DocumentationBuilder.ParsedOperator = Operator.OpType.Implicit;
6739                 $$ = null;
6740           }
6741         | OPERATOR overloadable_operator opt_doc_method_sig
6742           {
6743                 var p = (List<DocumentationParameter>)$3 ?? new List<DocumentationParameter> (1);
6744                 module.DocumentationBuilder.ParsedParameters = p;
6745                 module.DocumentationBuilder.ParsedOperator = (Operator.OpType) $2;
6746                 $$ = null;
6747           }
6748         ;
6749
6750 doc_type_declaration_name
6751         : type_declaration_name
6752         | doc_type_declaration_name DOT type_declaration_name
6753           {
6754                 $$ = new MemberName (((MemberName) $1), (MemberName) $3);
6755           }
6756         ;
6757
6758 opt_doc_method_sig
6759         : /* empty */
6760         | OPEN_PARENS
6761           {
6762                 valid_param_mod = ParameterModifierType.Ref | ParameterModifierType.Out;
6763           }
6764           opt_doc_parameters CLOSE_PARENS
6765           {
6766                 $$ = $3;
6767           }
6768         ;
6769
6770 opt_doc_parameters
6771         : /* empty */
6772           {
6773                 $$ = new List<DocumentationParameter> (0);
6774           }
6775         | doc_parameters
6776         ;
6777
6778 doc_parameters
6779         : doc_parameter
6780           {
6781                 var parameters = new List<DocumentationParameter> ();
6782                 parameters.Add ((DocumentationParameter) $1);
6783                 $$ = parameters;
6784           }
6785         | doc_parameters COMMA doc_parameter
6786           {
6787                 var parameters = $1 as List<DocumentationParameter>;
6788                 parameters.Add ((DocumentationParameter) $3);
6789                 $$ = parameters;
6790           }
6791         ;
6792
6793 doc_parameter
6794         : opt_parameter_modifier parameter_type
6795           {
6796                 if ($1 != null)
6797                         $$ = new DocumentationParameter ((Parameter.Modifier) $1, (FullNamedExpression) $2);
6798                 else
6799                         $$ = new DocumentationParameter ((FullNamedExpression) $2);
6800           }
6801         ;
6802
6803 %%
6804
6805 // <summary>
6806 //  A class used to hold info about an operator declarator
6807 // </summary>
6808 class OperatorDeclaration {
6809         public readonly Operator.OpType optype;
6810         public readonly FullNamedExpression ret_type;
6811         public readonly Location location;
6812
6813         public OperatorDeclaration (Operator.OpType op, FullNamedExpression ret_type, Location location)
6814         {
6815                 optype = op;
6816                 this.ret_type = ret_type;
6817                 this.location = location;
6818         }
6819 }
6820
6821 void Error_ExpectingTypeName (Expression expr)
6822 {
6823         if (expr is Invocation){
6824                 report.Error (1002, expr.Location, "Expecting `;'");
6825         } else {
6826                 expr.Error_InvalidExpressionStatement (report);
6827         }
6828 }
6829
6830 void Error_ParameterModifierNotValid (string modifier, Location loc)
6831 {
6832         report.Error (631, loc, "The parameter modifier `{0}' is not valid in this context",
6833                                       modifier);
6834 }
6835
6836 void Error_DuplicateParameterModifier (Location loc, Parameter.Modifier mod)
6837 {
6838         report.Error (1107, loc, "Duplicate parameter modifier `{0}'",
6839                 Parameter.GetModifierSignature (mod));
6840 }
6841
6842 void Error_TypeExpected (Location loc)
6843 {
6844         report.Error (1031, loc, "Type expected");
6845 }
6846
6847 void Error_UnsafeCodeNotAllowed (Location loc)
6848 {
6849         report.Error (227, loc, "Unsafe code requires the `unsafe' command line option to be specified");
6850 }
6851
6852 void Warning_EmptyStatement (Location loc)
6853 {
6854         report.Warning (642, 3, loc, "Possible mistaken empty statement");
6855 }
6856
6857 void Error_NamedArgumentExpected (NamedArgument a)
6858 {
6859         report.Error (1738, a.Location, "Named arguments must appear after the positional arguments");
6860 }
6861
6862 void Error_MissingInitializer (Location loc)
6863 {
6864         report.Error (210, loc, "You must provide an initializer in a fixed or using statement declaration");
6865 }
6866
6867 object Error_AwaitAsIdentifier (object token)
6868 {
6869         if (async_block) {
6870                 report.Error (4003, GetLocation (token), "`await' cannot be used as an identifier within an async method or lambda expression");
6871                 return new Tokenizer.LocatedToken ("await", GetLocation (token));
6872         }
6873
6874         return token;
6875 }
6876
6877 void push_current_container (TypeDefinition tc, object partial_token)
6878 {
6879         if (module.Evaluator != null){
6880                 tc.Definition.Modifiers = tc.ModFlags = (tc.ModFlags & ~Modifiers.AccessibilityMask) | Modifiers.PUBLIC;
6881                 if (undo == null)
6882                         undo = new Undo ();
6883
6884                 undo.AddTypeContainer (current_container, tc);
6885         }
6886
6887         if (partial_token != null)
6888                 current_container.AddPartial (tc);
6889         else
6890                 current_container.AddTypeContainer (tc);
6891
6892         ++lexer.parsing_declaration;
6893         current_container = tc;
6894         current_type = tc;
6895 }
6896
6897 TypeContainer pop_current_class ()
6898 {
6899         var retval = current_container;
6900
6901         current_container = current_container.Parent;
6902         current_type = current_type.Parent as TypeDefinition;
6903
6904         return retval;
6905 }
6906
6907 [System.Diagnostics.Conditional ("FULL_AST")]
6908 void StoreModifierLocation (object token, Location loc)
6909 {
6910         if (lbag == null)
6911                 return;
6912
6913         if (mod_locations == null)
6914                 mod_locations = new List<Tuple<Modifiers, Location>> ();
6915
6916         mod_locations.Add (Tuple.Create ((Modifiers) token, loc));
6917 }
6918
6919 [System.Diagnostics.Conditional ("FULL_AST")]
6920 void PushLocation (Location loc)
6921 {
6922         if (location_stack == null)
6923                 location_stack = new Stack<Location> ();
6924
6925         location_stack.Push (loc);
6926 }
6927
6928 Location PopLocation ()
6929 {
6930         if (location_stack == null)
6931                 return Location.Null;
6932
6933         return location_stack.Pop ();
6934 }
6935
6936 string CheckAttributeTarget (string a, Location l)
6937 {
6938         switch (a) {
6939         case "assembly" : case "module" : case "field" : case "method" : case "param" : case "property" : case "type" :
6940                         return a;
6941         }
6942
6943         report.Warning (658, 1, l,
6944                  "`{0}' is invalid attribute target. All attributes in this attribute section will be ignored", a);
6945         return string.Empty;
6946 }
6947
6948 static bool IsUnaryOperator (Operator.OpType op)
6949 {
6950         switch (op) {
6951
6952         case Operator.OpType.LogicalNot:
6953         case Operator.OpType.OnesComplement:
6954         case Operator.OpType.Increment:
6955         case Operator.OpType.Decrement:
6956         case Operator.OpType.True:
6957         case Operator.OpType.False:
6958         case Operator.OpType.UnaryPlus:
6959         case Operator.OpType.UnaryNegation:
6960                 return true;
6961         }
6962         return false;
6963 }
6964
6965 void syntax_error (Location l, string msg)
6966 {
6967         report.Error (1003, l, "Syntax error, " + msg);
6968 }
6969
6970 Tokenizer lexer;
6971
6972 public Tokenizer Lexer {
6973         get {
6974                 return lexer;
6975         }
6976 }
6977
6978 public CSharpParser (SeekableStreamReader reader, CompilationSourceFile file, ParserSession session)
6979         : this (reader, file, file.Compiler.Report, session)
6980 {
6981 }
6982
6983 public CSharpParser (SeekableStreamReader reader, CompilationSourceFile file, Report report, ParserSession session)
6984 {
6985         this.file = file;
6986         current_container = current_namespace = file;
6987
6988         this.module = file.Module;
6989         this.compiler = file.Compiler;
6990         this.settings = compiler.Settings;
6991         this.report = report;
6992
6993         lang_version = settings.Version;
6994         yacc_verbose_flag = settings.VerboseParserFlag;
6995         doc_support = settings.DocumentationFile != null;
6996         lexer = new Tokenizer (reader, file, session);
6997         oob_stack = new Stack<object> ();
6998         lbag = session.LocationsBag;
6999         use_global_stacks = session.UseJayGlobalArrays;
7000         parameters_bucket = session.ParametersStack;
7001 }
7002
7003 public void parse ()
7004 {
7005         eof_token = Token.EOF;
7006
7007         try {
7008                 if (yacc_verbose_flag > 1)
7009                         yyparse (lexer, new yydebug.yyDebugSimple ());
7010                 else
7011                         yyparse (lexer);
7012
7013                 Tokenizer tokenizer = lexer as Tokenizer;
7014                 tokenizer.cleanup ();
7015         } catch (Exception e){
7016                 if (e is yyParser.yyUnexpectedEof) {
7017                         Error_SyntaxError (yyToken);
7018                         UnexpectedEOF = true;
7019                         return;
7020                 }
7021
7022                 if (e is yyParser.yyException) {
7023                         if (report.Errors == 0)
7024                                 report.Error (-25, lexer.Location, "Parsing error");
7025                 } else {
7026                         // Used by compiler-tester to test internal errors
7027                         if (yacc_verbose_flag > 0 || e is FatalException)
7028                                 throw;
7029
7030                         report.Error (589, lexer.Location, "Internal compiler error during parsing" + e);
7031                 }
7032         }
7033 }
7034
7035 void CheckToken (int error, int yyToken, string msg, Location loc)
7036 {
7037         if (yyToken >= Token.FIRST_KEYWORD && yyToken <= Token.LAST_KEYWORD)
7038                 report.Error (error, loc, "{0}: `{1}' is a keyword", msg, GetTokenName (yyToken));
7039         else
7040                 report.Error (error, loc, msg);
7041 }
7042
7043 string ConsumeStoredComment ()
7044 {
7045         string s = tmpComment;
7046         tmpComment = null;
7047         Lexer.doc_state = XmlCommentState.Allowed;
7048         return s;
7049 }
7050
7051 void FeatureIsNotAvailable (Location loc, string feature)
7052 {
7053         report.FeatureIsNotAvailable (compiler, loc, feature);
7054 }
7055
7056 Location GetLocation (object obj)
7057 {
7058         var lt = obj as Tokenizer.LocatedToken;
7059         if (lt != null)
7060                 return lt.Location;
7061
7062         var mn = obj as MemberName;
7063         if (mn != null)
7064                 return mn.Location;
7065
7066         var expr = obj as Expression;
7067         if (expr != null)
7068                 return expr.Location;
7069
7070         return lexer.Location;
7071 }
7072
7073 void start_block (Location loc)
7074 {
7075         if (current_block == null) {
7076                 current_block = new ToplevelBlock (compiler, current_local_parameters, loc);
7077                 parsing_anonymous_method = false;
7078         } else if (parsing_anonymous_method) {
7079                 current_block = new ParametersBlock (current_block, current_local_parameters, loc);
7080                 parsing_anonymous_method = false;
7081         } else {
7082                 current_block = new ExplicitBlock (current_block, loc, Location.Null);
7083         }
7084 }
7085
7086 Block
7087 end_block (Location loc)
7088 {
7089         Block retval = current_block.Explicit;
7090         retval.SetEndLocation (loc);
7091         current_block = retval.Parent;
7092         return retval;
7093 }
7094
7095 void start_anonymous (bool isLambda, ParametersCompiled parameters, bool isAsync, Location loc)
7096 {
7097         oob_stack.Push (current_anonymous_method);
7098         oob_stack.Push (current_local_parameters);
7099         oob_stack.Push (current_variable);
7100         oob_stack.Push (async_block);
7101
7102         current_local_parameters = parameters;
7103         if (isLambda) {
7104                 if (lang_version <= LanguageVersion.ISO_2)
7105                         FeatureIsNotAvailable (loc, "lambda expressions");
7106
7107                 current_anonymous_method = new LambdaExpression (loc);
7108         } else {
7109                 if (lang_version == LanguageVersion.ISO_1)
7110                         FeatureIsNotAvailable (loc, "anonymous methods");
7111
7112                 current_anonymous_method = new AnonymousMethodExpression (loc);
7113         }
7114
7115         async_block = isAsync;
7116         // Force the next block to be created as a ToplevelBlock
7117         parsing_anonymous_method = true;
7118 }
7119
7120 /*
7121  * Completes the anonymous method processing, if lambda_expr is null, this
7122  * means that we have a Statement instead of an Expression embedded
7123  */
7124 AnonymousMethodExpression end_anonymous (ParametersBlock anon_block)
7125 {
7126         AnonymousMethodExpression retval;
7127
7128         if (async_block)
7129                 anon_block.IsAsync = true;
7130
7131         current_anonymous_method.Block = anon_block;
7132         retval = current_anonymous_method;
7133
7134         async_block = (bool) oob_stack.Pop ();
7135         current_variable = (BlockVariableDeclaration) oob_stack.Pop ();
7136         current_local_parameters = (ParametersCompiled) oob_stack.Pop ();
7137         current_anonymous_method = (AnonymousMethodExpression) oob_stack.Pop ();
7138
7139         return retval;
7140 }
7141
7142 void Error_SyntaxError (int token)
7143 {
7144         Error_SyntaxError (0, token);
7145 }
7146
7147 void Error_SyntaxError (int error_code, int token)
7148 {
7149         Error_SyntaxError (error_code, token, "Unexpected symbol");
7150 }
7151
7152 void Error_SyntaxError (int error_code, int token, string msg)
7153 {
7154         Lexer.CompleteOnEOF = false;
7155
7156         // An error message has been reported by tokenizer
7157         if (token == Token.ERROR)
7158                 return;
7159
7160         // Avoid duplicit error message after unterminated string literals
7161         if (token == Token.LITERAL && lexer.Location.Column == 0)
7162                 return;
7163
7164         string symbol = GetSymbolName (token);
7165         string expecting = GetExpecting ();
7166         var loc = lexer.Location - symbol.Length;
7167
7168         if (error_code == 0) {
7169                 if (expecting == "`identifier'") {
7170                         if (token > Token.FIRST_KEYWORD && token < Token.LAST_KEYWORD) {
7171                                 report.Error (1041, loc, "Identifier expected, `{0}' is a keyword", symbol);
7172                                 return;
7173                         }
7174
7175                         error_code = 1001;
7176                         expecting = "identifier";
7177                 } else if (expecting == "`)'") {
7178                         error_code = 1026;
7179                 } else {
7180                         error_code = 1525;
7181                 }
7182         }
7183
7184         if (string.IsNullOrEmpty (expecting))
7185                 report.Error (error_code, loc, "{1} `{0}'", symbol, msg);
7186         else
7187                 report.Error (error_code, loc, "{2} `{0}', expecting {1}", symbol, expecting, msg);
7188 }
7189
7190 string GetExpecting ()
7191 {
7192         int [] tokens = yyExpectingTokens (yyExpectingState);
7193         var names = new List<string> (tokens.Length);
7194         bool has_type = false;
7195         bool has_identifier = false;
7196         for (int i = 0; i < tokens.Length; i++){
7197                 int token = tokens [i];
7198                 has_identifier |= token == Token.IDENTIFIER;
7199
7200                 string name = GetTokenName (token);
7201                 if (name == "<internal>")
7202                         continue;
7203
7204                 has_type |= name == "type";
7205                 if (names.Contains (name))
7206                         continue;
7207
7208                 names.Add (name);
7209         }
7210
7211         //
7212         // Too many tokens to enumerate
7213         //
7214         if (names.Count > 8)
7215                 return null;
7216
7217         if (has_type && has_identifier)
7218                 names.Remove ("identifier");
7219
7220         if (names.Count == 1)
7221                 return "`" + GetTokenName (tokens [0]) + "'";
7222
7223         StringBuilder sb = new StringBuilder ();
7224         names.Sort ();
7225         int count = names.Count;
7226         for (int i = 0; i < count; i++){
7227                 bool last = i + 1 == count;
7228                 if (last)
7229                         sb.Append ("or ");
7230                 sb.Append ('`');
7231                 sb.Append (names [i]);
7232                 sb.Append (last ? "'" : count < 3 ? "' " : "', ");
7233         }
7234         return sb.ToString ();
7235 }
7236
7237
7238 string GetSymbolName (int token)
7239 {
7240         switch (token){
7241         case Token.LITERAL:
7242                 return ((Constant)lexer.Value).GetValue ().ToString ();
7243         case Token.IDENTIFIER:
7244                 return ((Tokenizer.LocatedToken)lexer.Value).Value;
7245
7246         case Token.BOOL:
7247                 return "bool";
7248         case Token.BYTE:
7249                 return "byte";
7250         case Token.CHAR:
7251                 return "char";
7252         case Token.VOID:
7253                 return "void";
7254         case Token.DECIMAL:
7255                 return "decimal";
7256         case Token.DOUBLE:
7257                 return "double";
7258         case Token.FLOAT:
7259                 return "float";
7260         case Token.INT:
7261                 return "int";
7262         case Token.LONG:
7263                 return "long";
7264         case Token.SBYTE:
7265                 return "sbyte";
7266         case Token.SHORT:
7267                 return "short";
7268         case Token.STRING:
7269                 return "string";
7270         case Token.UINT:
7271                 return "uint";
7272         case Token.ULONG:
7273                 return "ulong";
7274         case Token.USHORT:
7275                 return "ushort";
7276         case Token.OBJECT:
7277                 return "object";
7278
7279         case Token.PLUS:
7280                 return "+";
7281         case Token.UMINUS:
7282         case Token.MINUS:
7283                 return "-";
7284         case Token.BANG:
7285                 return "!";
7286         case Token.BITWISE_AND:
7287                 return "&";
7288         case Token.BITWISE_OR:
7289                 return "|";
7290         case Token.STAR:
7291                 return "*";
7292         case Token.PERCENT:
7293                 return "%";
7294         case Token.DIV:
7295                 return "/";
7296         case Token.CARRET:
7297                 return "^";
7298         case Token.OP_INC:
7299                 return "++";
7300         case Token.OP_DEC:
7301                 return "--";
7302         case Token.OP_SHIFT_LEFT:
7303                 return "<<";
7304         case Token.OP_SHIFT_RIGHT:
7305                 return ">>";
7306         case Token.OP_LT:
7307                 return "<";
7308         case Token.OP_GT:
7309                 return ">";
7310         case Token.OP_LE:
7311                 return "<=";
7312         case Token.OP_GE:
7313                 return ">=";
7314         case Token.OP_EQ:
7315                 return "==";
7316         case Token.OP_NE:
7317                 return "!=";
7318         case Token.OP_AND:
7319                 return "&&";
7320         case Token.OP_OR:
7321                 return "||";
7322         case Token.OP_PTR:
7323                 return "->";
7324         case Token.OP_COALESCING:
7325                 return "??";
7326         case Token.OP_MULT_ASSIGN:
7327                 return "*=";
7328         case Token.OP_DIV_ASSIGN:
7329                 return "/=";
7330         case Token.OP_MOD_ASSIGN:
7331                 return "%=";
7332         case Token.OP_ADD_ASSIGN:
7333                 return "+=";
7334         case Token.OP_SUB_ASSIGN:
7335                 return "-=";
7336         case Token.OP_SHIFT_LEFT_ASSIGN:
7337                 return "<<=";
7338         case Token.OP_SHIFT_RIGHT_ASSIGN:
7339                 return ">>=";
7340         case Token.OP_AND_ASSIGN:
7341                 return "&=";
7342         case Token.OP_XOR_ASSIGN:
7343                 return "^=";
7344         case Token.OP_OR_ASSIGN:
7345                 return "|=";
7346         }
7347
7348         return GetTokenName (token);
7349 }
7350
7351 static string GetTokenName (int token)
7352 {
7353         switch (token){
7354         case Token.ABSTRACT:
7355                 return "abstract";
7356         case Token.AS:
7357                 return "as";
7358         case Token.ADD:
7359                 return "add";
7360         case Token.ASYNC:
7361                 return "async";
7362         case Token.BASE:
7363                 return "base";
7364         case Token.BREAK:
7365                 return "break";
7366         case Token.CASE:
7367                 return "case";
7368         case Token.CATCH:
7369                 return "catch";
7370         case Token.CHECKED:
7371                 return "checked";
7372         case Token.CLASS:
7373                 return "class";
7374         case Token.CONST:
7375                 return "const";
7376         case Token.CONTINUE:
7377                 return "continue";
7378         case Token.DEFAULT:
7379                 return "default";
7380         case Token.DELEGATE:
7381                 return "delegate";
7382         case Token.DO:
7383                 return "do";
7384         case Token.ELSE:
7385                 return "else";
7386         case Token.ENUM:
7387                 return "enum";
7388         case Token.EVENT:
7389                 return "event";
7390         case Token.EXPLICIT:
7391                 return "explicit";
7392         case Token.EXTERN:
7393         case Token.EXTERN_ALIAS:
7394                 return "extern";
7395         case Token.FALSE:
7396                 return "false";
7397         case Token.FINALLY:
7398                 return "finally";
7399         case Token.FIXED:
7400                 return "fixed";
7401         case Token.FOR:
7402                 return "for";
7403         case Token.FOREACH:
7404                 return "foreach";
7405         case Token.GOTO:
7406                 return "goto";
7407         case Token.IF:
7408                 return "if";
7409         case Token.IMPLICIT:
7410                 return "implicit";
7411         case Token.IN:
7412                 return "in";
7413         case Token.INTERFACE:
7414                 return "interface";
7415         case Token.INTERNAL:
7416                 return "internal";
7417         case Token.IS:
7418                 return "is";
7419         case Token.LOCK:
7420                 return "lock";
7421         case Token.NAMESPACE:
7422                 return "namespace";
7423         case Token.NEW:
7424                 return "new";
7425         case Token.NULL:
7426                 return "null";
7427         case Token.OPERATOR:
7428                 return "operator";
7429         case Token.OUT:
7430                 return "out";
7431         case Token.OVERRIDE:
7432                 return "override";
7433         case Token.PARAMS:
7434                 return "params";
7435         case Token.PRIVATE:
7436                 return "private";
7437         case Token.PROTECTED:
7438                 return "protected";
7439         case Token.PUBLIC:
7440                 return "public";
7441         case Token.READONLY:
7442                 return "readonly";
7443         case Token.REF:
7444                 return "ref";
7445         case Token.RETURN:
7446                 return "return";
7447         case Token.REMOVE:
7448                 return "remove";
7449         case Token.SEALED:
7450                 return "sealed";
7451         case Token.SIZEOF:
7452                 return "sizeof";
7453         case Token.STACKALLOC:
7454                 return "stackalloc";
7455         case Token.STATIC:
7456                 return "static";
7457         case Token.STRUCT:
7458                 return "struct";
7459         case Token.SWITCH:
7460                 return "switch";
7461         case Token.THIS:
7462                 return "this";
7463         case Token.THROW:
7464                 return "throw";
7465         case Token.TRUE:
7466                 return "true";
7467         case Token.TRY:
7468                 return "try";
7469         case Token.TYPEOF:
7470                 return "typeof";
7471         case Token.UNCHECKED:
7472                 return "unchecked";
7473         case Token.UNSAFE:
7474                 return "unsafe";
7475         case Token.USING:
7476                 return "using";
7477         case Token.VIRTUAL:
7478                 return "virtual";
7479         case Token.VOLATILE:
7480                 return "volatile";
7481         case Token.WHERE:
7482                 return "where";
7483         case Token.WHILE:
7484                 return "while";
7485         case Token.ARGLIST:
7486                 return "__arglist";
7487         case Token.REFVALUE:
7488                 return "__refvalue";
7489         case Token.REFTYPE:
7490                 return "__reftype";
7491         case Token.MAKEREF:
7492                 return "__makeref";
7493         case Token.PARTIAL:
7494                 return "partial";
7495         case Token.ARROW:
7496                 return "=>";
7497         case Token.FROM:
7498         case Token.FROM_FIRST:
7499                 return "from";
7500         case Token.JOIN:
7501                 return "join";
7502         case Token.ON:
7503                 return "on";
7504         case Token.EQUALS:
7505                 return "equals";
7506         case Token.SELECT:
7507                 return "select";
7508         case Token.GROUP:
7509                 return "group";
7510         case Token.BY:
7511                 return "by";
7512         case Token.LET:
7513                 return "let";
7514         case Token.ORDERBY:
7515                 return "orderby";
7516         case Token.ASCENDING:
7517                 return "ascending";
7518         case Token.DESCENDING:
7519                 return "descending";
7520         case Token.INTO:
7521                 return "into";
7522         case Token.GET:
7523                 return "get";
7524         case Token.SET:
7525                 return "set";
7526         case Token.OPEN_BRACE:
7527                 return "{";
7528         case Token.CLOSE_BRACE:
7529                 return "}";
7530         case Token.OPEN_BRACKET:
7531         case Token.OPEN_BRACKET_EXPR:
7532                 return "[";
7533         case Token.CLOSE_BRACKET:
7534                 return "]";
7535         case Token.OPEN_PARENS_CAST:
7536         case Token.OPEN_PARENS_LAMBDA:
7537         case Token.OPEN_PARENS:
7538                 return "(";
7539         case Token.CLOSE_PARENS:
7540                 return ")";
7541         case Token.DOT:
7542                 return ".";
7543         case Token.COMMA:
7544                 return ",";
7545         case Token.DEFAULT_COLON:
7546                 return "default:";
7547         case Token.COLON:
7548                 return ":";
7549         case Token.SEMICOLON:
7550                 return ";";
7551         case Token.TILDE:
7552                 return "~";
7553
7554         case Token.PLUS:
7555         case Token.UMINUS:
7556         case Token.MINUS:
7557         case Token.BANG:
7558         case Token.OP_LT:
7559         case Token.OP_GT:
7560         case Token.BITWISE_AND:
7561         case Token.BITWISE_OR:
7562         case Token.STAR:
7563         case Token.PERCENT:
7564         case Token.DIV:
7565         case Token.CARRET:
7566         case Token.OP_INC:
7567         case Token.OP_DEC:
7568         case Token.OP_SHIFT_LEFT:
7569         case Token.OP_SHIFT_RIGHT:
7570         case Token.OP_LE:
7571         case Token.OP_GE:
7572         case Token.OP_EQ:
7573         case Token.OP_NE:
7574         case Token.OP_AND:
7575         case Token.OP_OR:
7576         case Token.OP_PTR:
7577         case Token.OP_COALESCING:
7578         case Token.OP_MULT_ASSIGN:
7579         case Token.OP_DIV_ASSIGN:
7580         case Token.OP_MOD_ASSIGN:
7581         case Token.OP_ADD_ASSIGN:
7582         case Token.OP_SUB_ASSIGN:
7583         case Token.OP_SHIFT_LEFT_ASSIGN:
7584         case Token.OP_SHIFT_RIGHT_ASSIGN:
7585         case Token.OP_AND_ASSIGN:
7586         case Token.OP_XOR_ASSIGN:
7587         case Token.OP_OR_ASSIGN:
7588                 return "<operator>";
7589
7590         case Token.BOOL:
7591         case Token.BYTE:
7592         case Token.CHAR:
7593         case Token.VOID:
7594         case Token.DECIMAL:
7595         case Token.DOUBLE:
7596         case Token.FLOAT:
7597         case Token.INT:
7598         case Token.LONG:
7599         case Token.SBYTE:
7600         case Token.SHORT:
7601         case Token.STRING:
7602         case Token.UINT:
7603         case Token.ULONG:
7604         case Token.USHORT:
7605         case Token.OBJECT:
7606                 return "type";
7607
7608         case Token.ASSIGN:
7609                 return "=";
7610         case Token.OP_GENERICS_LT:
7611         case Token.GENERIC_DIMENSION:
7612                 return "<";
7613         case Token.OP_GENERICS_GT:
7614                 return ">";
7615         case Token.INTERR:
7616         case Token.INTERR_NULLABLE:
7617                 return "?";
7618         case Token.DOUBLE_COLON:
7619                 return "::";
7620         case Token.LITERAL:
7621                 return "value";
7622         case Token.IDENTIFIER:
7623         case Token.AWAIT:
7624                 return "identifier";
7625
7626         case Token.EOF:
7627                 return "end-of-file";
7628
7629                 // All of these are internal.
7630         case Token.NONE:
7631         case Token.ERROR:
7632         case Token.FIRST_KEYWORD:
7633         case Token.EVAL_COMPILATION_UNIT_PARSER:
7634         case Token.EVAL_USING_DECLARATIONS_UNIT_PARSER:
7635         case Token.EVAL_STATEMENT_PARSER:
7636         case Token.LAST_KEYWORD:
7637         case Token.GENERATE_COMPLETION:
7638         case Token.COMPLETE_COMPLETION:
7639                 return "<internal>";
7640
7641                 // A bit more robust.
7642         default:
7643                 return yyNames [token];
7644         }
7645 }
7646
7647 /* end end end */
7648 }