2009-06-17 Marek Safar <marek.safar@gmail.com>
[mono.git] / mcs / mcs / cs-parser.jay
index c9655baecdfa6ac123c23c4f6a20621d5b11e974..b30fc6224fb72f9df45ced19615d85b20bd2c59c 100644 (file)
@@ -55,7 +55,7 @@ namespace Mono.CSharp
                
                // FIXME: This is very ugly and it's very hard to reset it correctly
                // on all places, especially when some parameters are autogenerated.
-               Parameters current_local_parameters;
+               ParametersCompiled current_local_parameters;
 
                /// <summary>
                ///   Using during property parsing to describe the implicit
@@ -63,7 +63,7 @@ namespace Mono.CSharp
                ///   methods (properties and indexers).
                /// </summary>
                FullNamedExpression implicit_value_parameter_type;
-               Parameters indexer_parameters;
+               ParametersCompiled indexer_parameters;
 
                /// <summary>
                ///   Hack to help create non-typed array initializer
@@ -119,9 +119,9 @@ namespace Mono.CSharp
                bool global_attrs_enabled = true;
                bool has_get, has_set;
                bool parameter_modifiers_not_allowed;
-               bool params_modifiers_not_allowed;
+               bool complex_parameters_modifiers_not_allowed;
                bool arglist_allowed;
-
+               bool default_parameter_used;
 
                /// When using the interactive parser, this holds the
                /// resulting expression
@@ -131,6 +131,9 @@ namespace Mono.CSharp
                // Keeps track of global data changes to undo on parser error
                //
                public Undo undo;
+               
+               // Stack<ToplevelBlock>
+               Stack linq_clause_blocks;
 
                // A counter to create new class names in interactive mode
                static int class_count;
@@ -228,8 +231,8 @@ namespace Mono.CSharp
 %token ARGLIST
 %token PARTIAL
 %token ARROW
-%token QUERY_FIRST_TOKEN
 %token FROM
+%token FROM_FIRST
 %token JOIN
 %token ON
 %token EQUALS
@@ -241,8 +244,13 @@ namespace Mono.CSharp
 %token ASCENDING
 %token DESCENDING
 %token INTO
-%token QUERY_LAST_TOKEN
 %token INTERR_NULLABLE
+%token EXTERN_ALIAS
+
+/* Generics <,> tokens */
+%token OP_GENERICS_LT
+%token OP_GENERICS_LT_DECL
+%token OP_GENERICS_GT
 
 /* C# keywords which are not really keywords */
 %token GET
@@ -257,6 +265,7 @@ namespace Mono.CSharp
 %token CLOSE_BRACKET
 %token OPEN_PARENS
 %token CLOSE_PARENS
+
 %token DOT
 %token COMMA
 %token COLON
@@ -268,10 +277,7 @@ namespace Mono.CSharp
 %token BANG
 %token ASSIGN
 %token OP_LT
-%token OP_GENERICS_LT
-%token OP_GENERICS_LT_DECL
 %token OP_GT
-%token OP_GENERICS_GT
 %token BITWISE_AND
 %token BITWISE_OR
 %token STAR
@@ -279,7 +285,6 @@ namespace Mono.CSharp
 %token DIV
 %token CARRET
 %token INTERR
-%token EXTERN_ALIAS
 
 /* C# multi-character operators. */
 %token DOUBLE_COLON
@@ -316,11 +321,7 @@ namespace Mono.CSharp
 
 %token IDENTIFIER
 %token OPEN_PARENS_LAMBDA
-%token CLOSE_PARENS_CAST
-%token CLOSE_PARENS_NO_CAST
-%token CLOSE_PARENS_OPEN_PARENS
-%token CLOSE_PARENS_MINUS
-%token DEFAULT_OPEN_PARENS
+%token OPEN_PARENS_CAST
 %token GENERIC_DIMENSION
 %token DEFAULT_COLON
 
@@ -329,11 +330,25 @@ namespace Mono.CSharp
 %token EVAL_COMPILATION_UNIT_PARSER
 %token EVAL_USING_DECLARATIONS_UNIT_PARSER
 
+// 
+// This token is generated to trigger the completion engine at this point
+//
+%token GENERATE_COMPLETION
+
+//
+// This token is return repeatedly after the first GENERATE_COMPLETION
+// token is produced and before the final EOF
+//
+%token COMPLETE_COMPLETION
+
 /* Add precedence rules to solve dangling else s/r conflict */
-%nonassoc LOWPREC
 %nonassoc IF
 %nonassoc ELSE
+
+/* Define the operator tokens and their precedences */
 %right ASSIGN
+%right OP_COALESCING
+%right INTERR
 %left OP_OR
 %left OP_AND
 %left BITWISE_OR
@@ -346,7 +361,6 @@ namespace Mono.CSharp
 %left OPEN_PARENS
 %left OPEN_BRACKET OPEN_BRACE
 %left DOT
-%nonassoc HIGHPREC
 
 %start compilation_unit
 %%
@@ -356,7 +370,7 @@ compilation_unit
         | outer_declarations global_attributes opt_EOF
         | global_attributes opt_EOF
        | opt_EOF /* allow empty files */
-       | interactive_parsing opt_EOF
+       | interactive_parsing  { Lexer.CompleteOnEOF = false; } opt_EOF
        ;
 
 opt_EOF
@@ -640,7 +654,7 @@ attribute_sections
 
                        if (global_attrs_enabled) {
                                if (current_attr_target == "module") {
-                                       CodeGen.Module.AddAttributes (sect);
+                                       current_container.Module.AddAttributes (sect);
                                        $$ = null;
                                } else if (current_attr_target != null && current_attr_target.Length > 0) {
                                        CodeGen.Assembly.AddAttributes (sect);
@@ -671,7 +685,7 @@ attribute_sections
 
                        if (global_attrs_enabled) {
                                if (current_attr_target == "module") {
-                                       CodeGen.Module.AddAttributes (sect);
+                                       current_container.Module.AddAttributes (sect);
                                        $$ = null;
                                } else if (current_attr_target == "assembly") {
                                        CodeGen.Assembly.AddAttributes (sect);
@@ -898,6 +912,7 @@ class_member_declaration
                Report.Error (1519, lexer.Location, "Unexpected symbol `{0}' in class, struct, or interface member declaration",
                        GetSymbolName (yyToken));
                $$ = null;
+               lexer.parsing_generic_declaration = false;
          }
        ;
 
@@ -1278,7 +1293,7 @@ method_header
                lexer.ConstraintsParsing = false;
                arglist_allowed = false;
                MemberName name = (MemberName) $4;
-               current_local_parameters = (Parameters) $7;
+               current_local_parameters = (ParametersCompiled) $7;
 
                if ($10 != null && name.TypeArguments == null)
                        Report.Error (80, lexer.Location,
@@ -1308,18 +1323,23 @@ method_header
          opt_modifiers
          PARTIAL
          VOID method_declaration_name
-         OPEN_PARENS opt_formal_parameter_list CLOSE_PARENS 
+         OPEN_PARENS
+         {
+               arglist_allowed = true;
+         }
+         opt_formal_parameter_list CLOSE_PARENS 
          {
                lexer.ConstraintsParsing = true;
          }
          opt_type_parameter_constraints_clauses
          {
                lexer.ConstraintsParsing = false;
+               arglist_allowed = false;
 
                MemberName name = (MemberName) $5;
-               current_local_parameters = (Parameters) $7;
+               current_local_parameters = (ParametersCompiled) $8;
 
-               if ($9 != null && name.TypeArguments == null)
+               if ($10 != null && name.TypeArguments == null)
                        Report.Error (80, lexer.Location,
                                      "Constraints are not allowed on non-generic declarations");
 
@@ -1329,7 +1349,7 @@ method_header
                        generic = new GenericMethod (current_namespace, current_class, name,
                                                     TypeManager.system_void_expr, current_local_parameters);
 
-                       generic.SetParameterInfo ((ArrayList) $10);
+                       generic.SetParameterInfo ((ArrayList) $11);
                }
 
                int modifiers = (int) $2;
@@ -1348,7 +1368,7 @@ method_header
                        Report.Error (751, name.Location, "A partial method must be declared within a " +
                                "partial class or partial struct");
                }
-
+               
                modifiers |= Modifiers.PARTIAL | Modifiers.PRIVATE;
                
                method = new Method (current_class, generic, TypeManager.system_void_expr,
@@ -1371,9 +1391,9 @@ method_header
                        "Member modifier `{0}' must precede the member type and name", Modifiers.Name ((int) $4));
 
                Method method = new Method (current_class, null, TypeManager.system_void_expr,
-                                           0, name, (Parameters) $7, (Attributes) $1);
+                                           0, name, (ParametersCompiled) $7, (Attributes) $1);
 
-               current_local_parameters = (Parameters) $7;
+               current_local_parameters = (ParametersCompiled) $7;
 
                if (RootContext.Documentation != null)
                        method.DocComment = Lexer.consume_doc_comment ();
@@ -1388,12 +1408,12 @@ method_body
        ;
 
 opt_formal_parameter_list
-       : /* empty */                   { $$ = Parameters.EmptyReadOnlyParameters; }
+       : /* empty */                   { $$ = ParametersCompiled.EmptyReadOnlyParameters; }
        | formal_parameter_list
        ;
        
 opt_parameter_list_no_mod
-       : /* empty */                   { $$ = Parameters.EmptyReadOnlyParameters; }
+       : /* empty */                   { $$ = ParametersCompiled.EmptyReadOnlyParameters; }
        | 
          {
                parameter_modifiers_not_allowed = true;
@@ -1406,14 +1426,14 @@ opt_parameter_list_no_mod
        ;
 
 formal_parameter_list
-       : fixed_parameters              
+       : fixed_parameters
          { 
                ArrayList pars_list = (ArrayList) $1;
 
                Parameter [] pars = new Parameter [pars_list.Count];
                pars_list.CopyTo (pars);
 
-               $$ = new Parameters (pars); 
+               $$ = new ParametersCompiled (pars); 
          } 
        | fixed_parameters COMMA parameter_array
          {
@@ -1423,7 +1443,7 @@ formal_parameter_list
                Parameter [] pars = new Parameter [pars_list.Count];
                pars_list.CopyTo (pars);
 
-               $$ = new Parameters (pars); 
+               $$ = new ParametersCompiled (pars); 
          }
        | fixed_parameters COMMA arglist_modifier
          {
@@ -1433,7 +1453,7 @@ formal_parameter_list
                Parameter [] pars = new Parameter [pars_list.Count];
                pars_list.CopyTo (pars);
 
-               $$ = new Parameters (pars, true);
+               $$ = new ParametersCompiled (pars, true);
          }
        | parameter_array COMMA error
          {
@@ -1459,11 +1479,11 @@ formal_parameter_list
          }
        | parameter_array 
          {
-               $$ = new Parameters (new Parameter[] { (Parameter) $1 } );
+               $$ = new ParametersCompiled (new Parameter[] { (Parameter) $1 } );
          }
        | arglist_modifier
          {
-               $$ = new Parameters (new Parameter [] { new ArglistParameter ((Location) $1) }, true);
+               $$ = new ParametersCompiled (new Parameter [] { new ArglistParameter ((Location) $1) }, true);
          }
        ;
 
@@ -1471,17 +1491,23 @@ fixed_parameters
        : fixed_parameter       
          {
                ArrayList pars = new ArrayList (4);
-
-               pars.Add ($1);
+               Parameter p = (Parameter) $1;
+               pars.Add (p);
+               
+               default_parameter_used = p.HasDefaultValue;
                $$ = pars;
          }
        | fixed_parameters COMMA fixed_parameter
          {
                ArrayList pars = (ArrayList) $1;
-               Parameter p = (Parameter)$3;
+               Parameter p = (Parameter) $3;
                if (p != null) {
                        if (p.HasExtensionMethodModifier)
                                Report.Error (1100, p.Location, "The parameter modifier `this' can only be used on the first parameter");
+                       else if (!p.HasDefaultValue && default_parameter_used)
+                               Report.Error (1737, p.Location, "Optional parameter cannot precede required parameters");
+
+                       default_parameter_used |= p.HasDefaultValue;
                        pars.Add (p);
                }
                $$ = $1;
@@ -1509,16 +1535,11 @@ fixed_parameter
        | opt_attributes
          opt_parameter_modifier
          type
+         error
          {
-               Report.Error (1001, GetLocation ($3), "Identifier expected");
-               $$ = new Parameter ((FullNamedExpression) $3, "NeedSomeGeneratorHere", (Parameter.Modifier) $2, (Attributes) $1, lexer.Location);               
-         }
-       | opt_attributes
-         opt_parameter_modifier
-         type
-         error {
-               CheckIdentifierToken (yyToken, GetLocation ($4));
-               $$ = null;
+               Location l = GetLocation ($4);
+               CheckIdentifierToken (yyToken, l);
+               $$ = new Parameter ((FullNamedExpression) $3, "NeedSomeGeneratorHere", (Parameter.Modifier) $2, (Attributes) $1, l);
          }
        | opt_attributes
          opt_parameter_modifier
@@ -1526,11 +1547,39 @@ fixed_parameter
          IDENTIFIER
          ASSIGN
          constant_expression
-          {
+         {
+               if (RootContext.Version <= LanguageVersion.V_3) {
+                       Report.FeatureIsNotAvailable (GetLocation ($5), "optional parameter");
+               }
+               
+               Parameter.Modifier mod = (Parameter.Modifier) $2;
+               if (mod != Parameter.Modifier.NONE) {
+                       switch (mod) {
+                       case Parameter.Modifier.REF:
+                       case Parameter.Modifier.OUT:
+                               Report.Error (1741, GetLocation ($2), "Cannot specify a default value for the `{0}' parameter",
+                                       Parameter.GetModifierSignature (mod));
+                               break;
+                               
+                       case Parameter.Modifier.This:
+                               Report.Error (1743, GetLocation ($2), "Cannot specify a default value for the `{0}' parameter",
+                                       Parameter.GetModifierSignature (mod));
+                               break;
+                       default:
+                               throw new NotImplementedException (mod.ToString ());
+                       }
+                               
+                       mod = Parameter.Modifier.NONE;
+               }
+               
+               if (complex_parameters_modifiers_not_allowed)
+                       Report.Error (1065, GetLocation ($6), "Optional parameter is not valid in this context");
+               
                LocatedToken lt = (LocatedToken) $4;
-               Report.Error (241, lt.Location, "Default parameter specifiers are not permitted");
-                $$ = null;
-          }
+               $$ = new Parameter ((FullNamedExpression) $3, lt.Value, mod, (Attributes) $1, lt.Location);
+               if ($6 != null)
+                       ((Parameter) $$).DefaultValue = (Expression) $6;
+         }
        ;
 
 opt_parameter_modifier
@@ -1595,10 +1644,17 @@ parameter_modifier
 
 parameter_array
        : opt_attributes params_modifier type IDENTIFIER
-         { 
+         {
                LocatedToken lt = (LocatedToken) $4;
                $$ = new ParamsParameter ((FullNamedExpression) $3, lt.Value, (Attributes) $1, lt.Location);
          }
+       | opt_attributes params_modifier type IDENTIFIER ASSIGN constant_expression
+         {
+               Report.Error (1751, GetLocation ($2), "Cannot specify a default value for a parameter array");
+               
+               LocatedToken lt = (LocatedToken) $4;
+               $$ = new ParamsParameter ((FullNamedExpression) $3, lt.Value, (Attributes) $1, lt.Location);            
+         }
        | opt_attributes params_modifier type error {
                CheckIdentifierToken (yyToken, GetLocation ($4));
                $$ = null;
@@ -1608,7 +1664,7 @@ parameter_array
 params_modifier
        : PARAMS
          {
-               if (params_modifiers_not_allowed)
+               if (complex_parameters_modifiers_not_allowed)
                        Report.Error (1670, ((Location) $1), "The `params' modifier is not allowed in current context");
          }
        | PARAMS parameter_modifier
@@ -1733,7 +1789,7 @@ get_accessor_declaration
                // If this is not the case, then current_local_parameters has already
                // been set in indexer_declaration
                if (parsing_indexer == false)
-                       current_local_parameters = null;
+                       current_local_parameters = ParametersCompiled.EmptyReadOnlyParameters;
                else 
                        current_local_parameters = indexer_parameters;
                lexer.PropertyParsing = false;
@@ -1741,7 +1797,7 @@ get_accessor_declaration
          accessor_body
          {
                if (has_get) {
-                       Report.Error (1007, (Location) $3, "Property accessor already defined");
+                       Report.Error (1007, GetLocation ($3), "Property accessor already defined");
                        break;
                }
                Accessor accessor = new Accessor ((ToplevelBlock) $5, (int) $2, (Attributes) $1, current_local_parameters, (Location) $3);
@@ -1765,9 +1821,9 @@ set_accessor_declaration
                        Parameter.Modifier.NONE, null, (Location) $3);
 
                if (!parsing_indexer) {
-                       current_local_parameters = new Parameters (new Parameter [] { implicit_value_parameter });
+                       current_local_parameters = new ParametersCompiled (new Parameter [] { implicit_value_parameter });
                } else {
-                       current_local_parameters = Parameters.MergeGenerated (
+                       current_local_parameters = ParametersCompiled.MergeGenerated (
                                indexer_parameters, true, implicit_value_parameter, null);
                }
                
@@ -1776,7 +1832,7 @@ set_accessor_declaration
          accessor_body
          {
                if (has_set) {
-                       Report.Error (1007, ((LocatedToken) $3).Location, "Property accessor already defined");
+                       Report.Error (1007, GetLocation ($3), "Property accessor already defined");
                        break;
                }
                Accessor accessor = new Accessor ((ToplevelBlock) $5, (int) $2, (Attributes) $1, current_local_parameters, (Location) $3);
@@ -1932,15 +1988,15 @@ operator_type
 operator_declarator
        : operator_type OPERATOR overloadable_operator OPEN_PARENS
          {
-               params_modifiers_not_allowed = true;
+               complex_parameters_modifiers_not_allowed = true;
          }
          opt_parameter_list_no_mod CLOSE_PARENS
          {
-               params_modifiers_not_allowed = false;
+               complex_parameters_modifiers_not_allowed = false;
 
                Location loc = (Location) $2;
                Operator.OpType op = (Operator.OpType) $3;
-               current_local_parameters = (Parameters)$6;
+               current_local_parameters = (ParametersCompiled)$6;
                
                int p_count = current_local_parameters.Count;
                if (p_count == 1) {
@@ -2007,14 +2063,14 @@ overloadable_operator
 conversion_operator_declarator
        : IMPLICIT OPERATOR type OPEN_PARENS
          {
-               params_modifiers_not_allowed = true;
+               complex_parameters_modifiers_not_allowed = true;
          }
          opt_parameter_list_no_mod CLOSE_PARENS
          {
-               params_modifiers_not_allowed = false;
+               complex_parameters_modifiers_not_allowed = false;
 
                Location loc = (Location) $2;
-               current_local_parameters = (Parameters)$6;  
+               current_local_parameters = (ParametersCompiled)$6;  
                  
                if (RootContext.Documentation != null) {
                        tmpComment = Lexer.consume_doc_comment ();
@@ -2025,14 +2081,14 @@ conversion_operator_declarator
          }
        | EXPLICIT OPERATOR type OPEN_PARENS
          {
-               params_modifiers_not_allowed = true;
+               complex_parameters_modifiers_not_allowed = true;
          }
          opt_parameter_list_no_mod CLOSE_PARENS
          {
-               params_modifiers_not_allowed = false;
+               complex_parameters_modifiers_not_allowed = false;
                
                Location loc = (Location) $2;
-               current_local_parameters = (Parameters)$6;  
+               current_local_parameters = (ParametersCompiled)$6;  
                  
                if (RootContext.Documentation != null) {
                        tmpComment = Lexer.consume_doc_comment ();
@@ -2043,11 +2099,13 @@ conversion_operator_declarator
          }
        | IMPLICIT error 
          {
-               syntax_error ((Location) $1, "'operator' expected");
+               Error_SyntaxError (yyToken);
+               $$ = new OperatorDeclaration (Operator.OpType.Implicit, null, GetLocation ($1));
          }
        | EXPLICIT error 
          {
-               syntax_error ((Location) $1, "'operator' expected");
+               Error_SyntaxError (yyToken);
+               $$ = new OperatorDeclaration (Operator.OpType.Explicit, null, GetLocation ($1));
          }
        ;
 
@@ -2078,10 +2136,12 @@ constructor_declarator
                        tmpComment = Lexer.consume_doc_comment ();
                        Lexer.doc_state = XmlCommentState.Allowed;
                }
+               arglist_allowed = true;
          }
          OPEN_PARENS opt_formal_parameter_list CLOSE_PARENS
          {
-               current_local_parameters = (Parameters) $6;  
+               arglist_allowed = false;
+               current_local_parameters = (ParametersCompiled) $6;  
                
                //
                // start block here, so possible anonymous methods inside
@@ -2148,7 +2208,7 @@ constructor_initializer
                $$ = new ConstructorThisInitializer ((ArrayList) $5, (Location) $2);
          }
        | COLON error {
-               Report.Error (1018, (Location) $1, "Keyword this or base expected");
+               Report.Error (1018, GetLocation ($1), "Keyword `this' or `base' expected");
                $$ = null;
          }
        ;
@@ -2160,8 +2220,10 @@ destructor_declaration
                        tmpComment = Lexer.consume_doc_comment ();
                        Lexer.doc_state = XmlCommentState.NotAllowed;
                }
+               
+               current_local_parameters = ParametersCompiled.EmptyReadOnlyParameters;
          }
-         IDENTIFIER OPEN_PARENS CLOSE_PARENS block
+         IDENTIFIER OPEN_PARENS CLOSE_PARENS method_body
          {
                LocatedToken lt = (LocatedToken) $5;
                if (lt.Value != current_container.MemberName.Name){
@@ -2169,15 +2231,16 @@ destructor_declaration
                } else if (current_container.Kind != Kind.Class){
                        Report.Error (575, lt.Location, "Only class types can contain destructor");
                } else {
-                       Method d = new Destructor (
-                               current_class, TypeManager.system_void_expr, (int) $2, "Finalize", 
-                               Parameters.EmptyReadOnlyParameters, (Attributes) $1, lt.Location);
+                       Destructor d = new Destructor (current_class, (int) $2,
+                               ParametersCompiled.EmptyReadOnlyParameters, (Attributes) $1, lt.Location);
                        if (RootContext.Documentation != null)
                                d.DocComment = ConsumeStoredComment ();
                  
                        d.Block = (ToplevelBlock) $8;
                        current_container.AddMethod (d);
                }
+
+               current_local_parameters = null;
          }
        ;
 
@@ -2220,7 +2283,7 @@ event_declaration
          OPEN_BRACE
          {
                implicit_value_parameter_type = (FullNamedExpression) $4;  
-               current_local_parameters = new Parameters (
+               current_local_parameters = new ParametersCompiled (
                        new Parameter (implicit_value_parameter_type, "value", 
                        Parameter.Modifier.NONE, null, GetLocation ($3)));
 
@@ -2345,10 +2408,15 @@ indexer_declaration
          OPEN_BRACE
          {
                implicit_value_parameter_type = (FullNamedExpression) $3;
-               indexer_parameters = (Parameters) $6;
+               indexer_parameters = (ParametersCompiled) $6;
                
-               if (indexer_parameters.IsEmpty)
+               if (indexer_parameters.IsEmpty) {
                        Report.Error (1551, GetLocation ($5), "Indexers must have at least one parameter");
+               } else if (indexer_parameters.Count == 1) {
+                       Parameter p = indexer_parameters [0];
+                       if (p.HasDefaultValue)
+                               p.Warning_UselessOptionalParameter ();
+               }
 
                if (RootContext.Documentation != null) {
                        tmpComment = Lexer.consume_doc_comment ();
@@ -2373,7 +2441,7 @@ indexer_declaration
                bool order = accessors != null ? accessors.declared_in_reverse : false;
 
                Indexer indexer = new Indexer (current_class, (FullNamedExpression) $3,
-                       (MemberName)$4, (int) $2, (Parameters) $6, (Attributes) $1,
+                       (MemberName)$4, (int) $2, (ParametersCompiled) $6, (Attributes) $1,
                        get_block, set_block, order);
                                       
                if ($3 == TypeManager.system_void_expr)
@@ -2520,6 +2588,7 @@ enum_member_declaration
          }
        | opt_attributes IDENTIFIER
          {
+               ++lexer.parsing_block;
                if (RootContext.Documentation != null) {
                        tmpComment = Lexer.consume_doc_comment ();
                        Lexer.doc_state = XmlCommentState.NotAllowed;
@@ -2527,6 +2596,7 @@ enum_member_declaration
          }
          ASSIGN constant_expression
          { 
+               --lexer.parsing_block;    
                VariableDeclaration vd = new VariableDeclaration (
                        (LocatedToken) $2, $5, (Attributes) $1);
 
@@ -2545,7 +2615,7 @@ delegate_declaration
          OPEN_PARENS opt_formal_parameter_list CLOSE_PARENS
          {
                MemberName name = MakeName ((MemberName) $5);
-               Parameters p = (Parameters) $7;
+               ParametersCompiled p = (ParametersCompiled) $7;
 
                Delegate del = new Delegate (current_namespace, current_class, (FullNamedExpression) $4,
                                             (int) $2, name, p, (Attributes) $1);
@@ -2579,7 +2649,9 @@ opt_nullable
          }
        | INTERR_NULLABLE
          {
-               if (RootContext.Version < LanguageVersion.ISO_2)
+               if (RootContext.MetadataCompatibilityVersion < MetadataVersion.v2)        
+                       Report.FeatureIsNotSupported (lexer.Location, "nullable types");
+               else if (RootContext.Version < LanguageVersion.ISO_2)
                        Report.FeatureIsNotAvailable (lexer.Location, "nullable types");
          
                $$ = this;
@@ -2621,7 +2693,9 @@ opt_type_argument_list
        : /* empty */                { $$ = null; } 
        | OP_GENERICS_LT type_arguments OP_GENERICS_GT
          {
-               if (RootContext.Version < LanguageVersion.ISO_2)
+               if (RootContext.MetadataCompatibilityVersion < MetadataVersion.v2)        
+                       Report.FeatureIsNotSupported (lexer.Location, "generics");
+               else if (RootContext.Version < LanguageVersion.ISO_2)
                        Report.FeatureIsNotAvailable (GetLocation ($1), "generics");      
          
                $$ = $2;
@@ -2629,21 +2703,21 @@ opt_type_argument_list
        | OP_GENERICS_LT error
          {
                Error_TypeExpected (lexer.Location);
-               $$ = new TypeArguments (lexer.Location);
+               $$ = new TypeArguments ();
          }
        ;
 
 type_arguments
        : type
          {
-               TypeArguments type_args = new TypeArguments (lexer.Location);
-               type_args.Add ((Expression) $1);
+               TypeArguments type_args = new TypeArguments ();
+               type_args.Add ((FullNamedExpression) $1);
                $$ = type_args;
          }
        | type_arguments COMMA type
          {
                TypeArguments type_args = (TypeArguments) $1;
-               type_args.Add ((Expression) $3);
+               type_args.Add ((FullNamedExpression) $3);
                $$ = type_args;
          }       
        ;
@@ -2721,7 +2795,9 @@ opt_type_parameter_list
        : /* empty */                { $$ = null; } 
        | OP_GENERICS_LT_DECL type_parameters OP_GENERICS_GT
          {
-               if (RootContext.Version < LanguageVersion.ISO_2)
+               if (RootContext.MetadataCompatibilityVersion < MetadataVersion.v2)        
+                       Report.FeatureIsNotSupported (lexer.Location, "generics");
+               else if (RootContext.Version < LanguageVersion.ISO_2)
                        Report.FeatureIsNotAvailable (GetLocation ($1), "generics");
          
                $$ = $2;
@@ -2731,23 +2807,23 @@ opt_type_parameter_list
 type_parameters
        : type_parameter
          {
-               TypeArguments type_args = new TypeArguments (lexer.Location);
-               type_args.Add ((Expression)$1);
+               TypeArguments type_args = new TypeArguments ();
+               type_args.Add ((FullNamedExpression)$1);
                $$ = type_args;
          }
        | type_parameters COMMA type_parameter
          {
                TypeArguments type_args = (TypeArguments) $1;
-               type_args.Add ((Expression)$3);
+               type_args.Add ((FullNamedExpression)$3);
                $$ = type_args;
          }       
        ;
 
 type_parameter
-       : opt_attributes IDENTIFIER
+       : opt_attributes opt_type_parameter_variance IDENTIFIER
          {
-               LocatedToken lt = (LocatedToken)$2;
-               $$ = new TypeParameterName (lt.Value, (Attributes)$1, lt.Location);
+               LocatedToken lt = (LocatedToken)$3;
+               $$ = new TypeParameterName (lt.Value, (Attributes)$1, (Variance) $2, lt.Location);
          }
        | error
          {
@@ -2816,8 +2892,7 @@ type_expression
                if ($2 != null) {
                        $$ = new ComposedCast (name.GetTypeExpression (), "?", lexer.Location);
                } else {
-                       if (name.Left == null && name.Name == "var" &&
-                           (RootContext.Version > LanguageVersion.ISO_2 || RootContext.Version == LanguageVersion.Default_MCS))
+                       if (name.Left == null && name.Name == "var" && RootContext.Version > LanguageVersion.ISO_2)
                                $$ = current_array_type = new VarExpr (name.Location);
                        else
                                $$ = name.GetTypeExpression ();
@@ -2843,44 +2918,6 @@ type_expression
          }     
        ;
 
-non_expression_type
-       : builtin_types opt_nullable
-         {
-               if ($2 != null)
-                       $$ = new ComposedCast ((FullNamedExpression) $1, "?", lexer.Location);
-         }
-       | VOID
-         {
-               $$ = TypeManager.system_void_expr;
-         }
-       | non_expression_type rank_specifiers
-         {
-               Location loc = GetLocation ($1);
-               if (loc.IsNull)
-                       loc = lexer.Location;
-               $$ = new ComposedCast ((FullNamedExpression) $1, (string) $2, loc);
-         }
-       | non_expression_type STAR
-         {
-               Location loc = GetLocation ($1);
-               if (loc.IsNull)
-                       loc = lexer.Location;
-               $$ = new ComposedCast ((FullNamedExpression) $1, "*", loc);
-         }
-       //
-       // We need this because the parser will happily go and reduce IDENTIFIER STAR
-       // through this different path
-       //
-       | multiplicative_expression STAR 
-         {
-               FullNamedExpression e = $1 as FullNamedExpression;
-               if (e != null)
-                       $$ = new ComposedCast (e, "*");
-               else
-                       Error_TypeExpected (GetLocation ($1));
-         }
-       ;
-
 type_list
        : base_type_name
          {
@@ -2911,7 +2948,7 @@ base_type_name
        
 /*
  * replaces all the productions for isolating the various
- * simple types, but we need this to reuse it easily in local_variable_type
+ * simple types, but we need this to reuse it easily in variable_type
  */
 builtin_types
        : OBJECT        { $$ = TypeManager.system_object_expr; }
@@ -2960,6 +2997,10 @@ primary_expression_no_array_creation
                LocatedToken lt = (LocatedToken) $1;
                $$ = new SimpleName (MemberName.MakeName (lt.Value, (TypeArguments)$2), (TypeArguments)$2, lt.Location);          
          }
+       | IDENTIFIER GENERATE_COMPLETION {
+               LocatedToken lt = (LocatedToken) $1;
+              $$ = new CompletionSimpleName (MemberName.MakeName (lt.Value, null), lt.Location);
+         }
        | parenthesized_expression
        | default_value_expression
        | member_access
@@ -3016,36 +3057,29 @@ boolean_literal
        | FALSE                 { $$ = new BoolLiteral (false, lexer.Location); }
        ;
 
-parenthesized_expression_0
-       : OPEN_PARENS expression CLOSE_PARENS
-         {
-               $$ = $2;
-               lexer.Deambiguate_CloseParens ($$);
-               // After this, the next token returned is one of
-               // CLOSE_PARENS_CAST, CLOSE_PARENS_NO_CAST (CLOSE_PARENS), CLOSE_PARENS_OPEN_PARENS
-               // or CLOSE_PARENS_MINUS.
-         }
-       | OPEN_PARENS expression error { CheckToken (1026, yyToken, "Expecting ')'", lexer.Location); }
+
+//
+// Here is the trick, tokenizer may think that parens is a special but
+// parser is interested in open parens only, so we merge them.
+// Consider: if (a)foo ();
+//
+open_parens_any
+       : OPEN_PARENS
+       | OPEN_PARENS_CAST
+       | OPEN_PARENS_LAMBDA
        ;
 
 parenthesized_expression
-       : parenthesized_expression_0 CLOSE_PARENS_NO_CAST
-         {
-               $$ = $1;
-         }  
-       | parenthesized_expression_0 CLOSE_PARENS
+       : OPEN_PARENS expression CLOSE_PARENS
          {
-               $$ = $1;
+               $$ = new ParenthesizedExpression ((Expression) $2);
          }
-       | parenthesized_expression_0 CLOSE_PARENS_MINUS
+       | OPEN_PARENS expression COMPLETE_COMPLETION
          {
-               // If a parenthesized expression is followed by a minus, we need to wrap
-               // the expression inside a ParenthesizedExpression for the CS0075 check
-               // in Binary.DoResolve().
-               $$ = new ParenthesizedExpression ((Expression) $1);
+               $$ = new ParenthesizedExpression ((Expression) $2);
          }
        ;
-
+       
 member_access
        : primary_expression DOT IDENTIFIER opt_type_argument_list
          {
@@ -3065,32 +3099,28 @@ member_access
 
                $$ = new QualifiedAliasMember (lt1.Value, lt2.Value, (TypeArguments) $3, lt1.Location);
          }
-       ;
-
-invocation_expression
-       : primary_expression OPEN_PARENS opt_argument_list CLOSE_PARENS
-         {
-               $$ = new Invocation ((Expression) $1, (ArrayList) $3);
+       | primary_expression DOT GENERATE_COMPLETION {
+               $$ = new CompletionMemberAccess ((Expression) $1, null,GetLocation ($3));
          }
-       | parenthesized_expression_0 CLOSE_PARENS_OPEN_PARENS OPEN_PARENS CLOSE_PARENS
-         {
-               $$ = new Invocation ((Expression) $1, new ArrayList ());
-         }
-       | parenthesized_expression_0 CLOSE_PARENS_OPEN_PARENS primary_expression
-         {
-               $$ = new InvocationOrCast ((Expression) $1, (Expression) $3);
+       | primary_expression DOT IDENTIFIER GENERATE_COMPLETION {
+               LocatedToken lt = (LocatedToken) $3;
+               $$ = new CompletionMemberAccess ((Expression) $1, lt.Value, lt.Location);
          }
-       | parenthesized_expression_0 CLOSE_PARENS_OPEN_PARENS OPEN_PARENS non_simple_argument CLOSE_PARENS
+       | predefined_type DOT GENERATE_COMPLETION
          {
-               ArrayList args = new ArrayList (1);
-               args.Add ($4);
-               $$ = new Invocation ((Expression) $1, args);
+               // TODO: Location is wrong as some predefined types doesn't hold a location
+               $$ = new CompletionMemberAccess ((Expression) $1, null, lexer.Location);
          }
-       | parenthesized_expression_0 CLOSE_PARENS_OPEN_PARENS OPEN_PARENS argument_list COMMA argument CLOSE_PARENS
+       | predefined_type DOT IDENTIFIER GENERATE_COMPLETION {
+               LocatedToken lt = (LocatedToken) $3;
+               $$ = new CompletionMemberAccess ((Expression) $1, lt.Value, lt.Location);
+         }
+       ;
+
+invocation_expression
+       : primary_expression open_parens_any opt_argument_list CLOSE_PARENS
          {
-               ArrayList args = ((ArrayList) $4);
-               args.Add ($6);
-               $$ = new Invocation ((Expression) $1, args);
+               $$ = new Invocation ((Expression) $1, (ArrayList) $3);
          }
        ;
 
@@ -3100,12 +3130,12 @@ opt_object_or_collection_initializer
        ;
 
 object_or_collection_initializer
-       : OPEN_BRACE opt_member_initializer_list CLOSE_BRACE
+       : OPEN_BRACE opt_member_initializer_list close_brace_or_complete_completion
          {
                if ($2 == null)
-                 $$ = CollectionOrObjectInitializers.Empty;
+                       $$ = CollectionOrObjectInitializers.Empty;
                else
-                 $$ = new CollectionOrObjectInitializers ((ArrayList) $2, GetLocation ($1));
+                       $$ = new CollectionOrObjectInitializers ((ArrayList) $2, GetLocation ($1));
          }
        | OPEN_BRACE member_initializer_list COMMA CLOSE_BRACE
          {
@@ -3122,7 +3152,7 @@ opt_member_initializer_list
        ;
 
 member_initializer_list
-       : member_initializer
+       : member_initializer 
          {
                ArrayList a = new ArrayList ();
                a.Add ($1);
@@ -3142,9 +3172,16 @@ member_initializer
                LocatedToken lt = $1 as LocatedToken;
                $$ = new ElementInitializer (lt.Value, (Expression)$3, lt.Location);
          }
-       | non_assignment_expression
+       | GENERATE_COMPLETION 
          {
-               $$ = new CollectionElementInitializer ((Expression)$1);
+               $$ = new CompletionElementInitializer (null, GetLocation ($1));
+         }
+       | non_assignment_expression opt_COMPLETE_COMPLETION  {
+               CompletionSimpleName csn = $1 as CompletionSimpleName;
+               if (csn == null)
+                       $$ = new CollectionElementInitializer ((Expression)$1);
+               else
+                       $$ = new CompletionElementInitializer (csn.Prefix, csn.Location);
          }
        | OPEN_BRACE expression_list CLOSE_BRACE
          {
@@ -3211,7 +3248,7 @@ non_simple_argument
          { 
                $$ = new Argument ((Expression) $2, Argument.AType.Out);
          }
-       | ARGLIST OPEN_PARENS argument_list CLOSE_PARENS
+       | ARGLIST open_parens_any argument_list CLOSE_PARENS
          {
                ArrayList list = (ArrayList) $3;
                Argument[] args = new Argument [list.Count];
@@ -3220,7 +3257,7 @@ non_simple_argument
                Expression expr = new Arglist (args, (Location) $1);
                $$ = new Argument (expr, Argument.AType.Expression);
          }
-       | ARGLIST OPEN_PARENS CLOSE_PARENS
+       | ARGLIST open_parens_any CLOSE_PARENS
          {
                $$ = new Argument (new Arglist ((Location) $1), Argument.AType.Expression);
          }       
@@ -3312,70 +3349,81 @@ base_access
 post_increment_expression
        : primary_expression OP_INC
          {
-               $$ = new UnaryMutator (UnaryMutator.Mode.PostIncrement,
-                                      (Expression) $1, (Location) $2);
+               $$ = new UnaryMutator (UnaryMutator.Mode.PostIncrement, (Expression) $1);
          }
        ;
 
 post_decrement_expression
        : primary_expression OP_DEC
          {
-               $$ = new UnaryMutator (UnaryMutator.Mode.PostDecrement,
-                                      (Expression) $1, (Location) $2);
+               $$ = new UnaryMutator (UnaryMutator.Mode.PostDecrement, (Expression) $1);
          }
        ;
 
 object_or_delegate_creation_expression
-       : NEW simple_type OPEN_PARENS opt_argument_list CLOSE_PARENS opt_object_or_collection_initializer
+       : new_expr_start open_parens_any opt_argument_list CLOSE_PARENS opt_object_or_collection_initializer
          {
-               if ($6 != null) {
+               if ($5 != null) {
                        if (RootContext.Version <= LanguageVersion.ISO_2)
                                Report.FeatureIsNotAvailable (GetLocation ($1), "object initializers");
                                
-                       $$ = new NewInitialize ((Expression) $2, (ArrayList) $4, (CollectionOrObjectInitializers) $6, (Location) $1);
+                       $$ = new NewInitialize ((Expression) $1, (ArrayList) $3, (CollectionOrObjectInitializers) $5, GetLocation ($1));
                }
                else
-                       $$ = new New ((Expression) $2, (ArrayList) $4, (Location) $1);
+                       $$ = new New ((Expression) $1, (ArrayList) $3, GetLocation ($1));
          }
-       | NEW simple_type object_or_collection_initializer
+       | new_expr_start object_or_collection_initializer
          {
                if (RootContext.Version <= LanguageVersion.ISO_2)
                        Report.FeatureIsNotAvailable (GetLocation ($1), "collection initializers");
          
-               $$ = new NewInitialize ((Expression) $2, null, (CollectionOrObjectInitializers) $3, (Location) $1);
+               $$ = new NewInitialize ((Expression) $1, null, (CollectionOrObjectInitializers) $2, GetLocation ($1));
          }
        ;
 
-
 array_creation_expression
-       : NEW simple_type OPEN_BRACKET expression_list CLOSE_BRACKET 
+       : new_expr_start OPEN_BRACKET expression_list CLOSE_BRACKET 
          opt_rank_specifier    // shift/reduce on OPEN_BRACE
          opt_array_initializer
          {
-               $$ = new ArrayCreation ((FullNamedExpression) $2, (ArrayList) $4, (string) $6, (ArrayList) $7, (Location) $1);
+               $$ = new ArrayCreation ((FullNamedExpression) $1, (ArrayList) $3, (string) $5, (ArrayList) $6, GetLocation ($1));
          }
-       | NEW simple_type rank_specifiers opt_array_initializer
+       | new_expr_start rank_specifiers opt_array_initializer
          {
-               if ($4 == null)
+               if ($3 == null)
                        Report.Error (1586, GetLocation ($1), "Array creation must have array size or array initializer");
 
-               $$ = new ArrayCreation ((FullNamedExpression) $2, (string) $3, (ArrayList) $4, (Location) $1);
+               $$ = new ArrayCreation ((FullNamedExpression) $1, (string) $2, (ArrayList) $3, GetLocation ($1));
          }
        | NEW rank_specifiers array_initializer
          {
-               $$ = new ImplicitlyTypedArrayCreation ((string) $2, (ArrayList) $3, (Location) $1);
+               $$ = new ImplicitlyTypedArrayCreation ((string) $2, (ArrayList) $3, GetLocation ($1));
          }
-       | NEW simple_type error
+       | new_expr_start error
          {
-               Report.Error (1526, (Location) $1, "A new expression requires () or [] after type");
+               Report.Error (1526, GetLocation ($1), "A new expression requires () or [] after type");
                $$ = null;
          }
        ;
 
+new_expr_start
+       : NEW
+         {
+               ++lexer.parsing_type;
+         }
+         simple_type
+         {
+               --lexer.parsing_type;
+               $$ = $3;
+         }
+       ;
+
 anonymous_type_expression
        : NEW OPEN_BRACE anonymous_type_parameters_opt_comma CLOSE_BRACE
          {
-               if (RootContext.Version <= LanguageVersion.ISO_2)
+               if (RootContext.MetadataCompatibilityVersion < MetadataVersion.v2)        
+                       Report.FeatureIsNotSupported (lexer.Location, "anonymous types");
+               else if (RootContext.Version <= LanguageVersion.ISO_2)
                        Report.FeatureIsNotAvailable (GetLocation ($1), "anonymous types");
 
                $$ = new AnonymousTypeDeclaration ((ArrayList) $3, current_container, GetLocation ($1));
@@ -3549,7 +3597,7 @@ typeof_expression
                pushed_current_array_type = current_array_type;
                lexer.TypeOfParsing = true;
          }
-         OPEN_PARENS typeof_type_expression CLOSE_PARENS
+         open_parens_any typeof_type_expression CLOSE_PARENS
          {
                lexer.TypeOfParsing = false;
                Expression type = (Expression)$4;
@@ -3563,13 +3611,7 @@ typeof_expression
        
 typeof_type_expression
        : type_and_void
-         {
-               $$ = $1;
-         }
        | unbound_type_name
-         {
-               $$ = new UnboundTypeExpression ((MemberName)$1, lexer.Location);
-         }
        | error
         {
                Error_TypeExpected (lexer.Location);
@@ -3581,41 +3623,46 @@ unbound_type_name
        : IDENTIFIER generic_dimension
          {  
                LocatedToken lt = (LocatedToken) $1;
-               TypeArguments ta = (TypeArguments)$2;
 
-               $$ = new MemberName (lt.Value, ta, lt.Location);
+               $$ = new SimpleName (MemberName.MakeName (lt.Value, (int)$2), lt.Location);
          }
        | qualified_alias_member IDENTIFIER generic_dimension
          {
                LocatedToken lt1 = (LocatedToken) $1;
                LocatedToken lt2 = (LocatedToken) $2;
-               TypeArguments ta = (TypeArguments)$3;
 
-               $$ = new MemberName (new MemberName (lt1.Value, lt1.Location), lt2.Value, ta, lt2.Location);
+               $$ = new QualifiedAliasMember (lt1.Value, MemberName.MakeName (lt2.Value, (int) $3), lt1.Location);
+         }
+       | unbound_type_name DOT IDENTIFIER
+         {
+               LocatedToken lt = (LocatedToken) $3;
+               
+               $$ = new MemberAccess ((Expression) $1, lt.Value, lt.Location);         
          }
        | unbound_type_name DOT IDENTIFIER generic_dimension
          {
                LocatedToken lt = (LocatedToken) $3;
-               TypeArguments ta = (TypeArguments)$4;
                
-               $$ = new MemberName ((MemberName)$1, lt.Value, ta, lt.Location);
+               $$ = new MemberAccess ((Expression) $1, MemberName.MakeName (lt.Value, (int) $4), lt.Location);         
          }
        | namespace_or_type_name DOT IDENTIFIER generic_dimension
          {
                LocatedToken lt = (LocatedToken) $3;
-               TypeArguments ta = (TypeArguments)$4;
-               
-               $$ = new MemberName ((MemberName)$1, lt.Value, ta, lt.Location);                
+               MemberName name = (MemberName) $1;
+
+               $$ = new MemberAccess (name.GetTypeExpression (), MemberName.MakeName (lt.Value, (int) $4), lt.Location);               
          }
        ;
-       
+
 generic_dimension
        : GENERIC_DIMENSION
          {
-               if (RootContext.Version < LanguageVersion.ISO_2)
+               if (RootContext.MetadataCompatibilityVersion < MetadataVersion.v2)        
+                       Report.FeatureIsNotSupported (lexer.Location, "generics");
+               else if (RootContext.Version < LanguageVersion.ISO_2)
                        Report.FeatureIsNotAvailable (lexer.Location, "generics");
 
-               $$ = new TypeArguments ((int)$1, lexer.Location);
+               $$ = $1;
          }
        ;
        
@@ -3631,20 +3678,20 @@ qualified_alias_member
        ;
 
 sizeof_expression
-       : SIZEOF OPEN_PARENS type CLOSE_PARENS { 
+       : SIZEOF open_parens_any type CLOSE_PARENS { 
                $$ = new SizeOf ((Expression) $3, (Location) $1);
          }
        ;
 
 checked_expression
-       : CHECKED OPEN_PARENS expression CLOSE_PARENS
+       : CHECKED open_parens_any expression CLOSE_PARENS
          {
                $$ = new CheckedExpr ((Expression) $3, (Location) $1);
          }
        ;
 
 unchecked_expression
-       : UNCHECKED OPEN_PARENS expression CLOSE_PARENS
+       : UNCHECKED open_parens_any expression CLOSE_PARENS
          {
                $$ = new UnCheckedExpr ((Expression) $3, (Location) $1);
          }
@@ -3664,38 +3711,41 @@ pointer_member_access
 anonymous_method_expression
        : DELEGATE opt_anonymous_method_signature
          {
-               start_anonymous (false, (Parameters) $2, (Location) $1);
+               start_anonymous (false, (ParametersCompiled) $2, (Location) $1);
          }
          block
          {
-               $$ = end_anonymous ((ToplevelBlock) $4, (Location) $1);
+               $$ = end_anonymous ((ToplevelBlock) $4);
        }
        ;
 
 opt_anonymous_method_signature
-       : /* empty */                   { $$ = null; } 
+       : 
+         {
+               $$ = ParametersCompiled.Undefined;
+         } 
        | anonymous_method_signature
        ;
 
 anonymous_method_signature
        : OPEN_PARENS
          {
-               params_modifiers_not_allowed = true; 
+               complex_parameters_modifiers_not_allowed = true; 
          }
          opt_formal_parameter_list CLOSE_PARENS
          {
-               params_modifiers_not_allowed = false;
+               complex_parameters_modifiers_not_allowed = false;
                $$ = $3;
          }
        ;
 
 default_value_expression
-       : DEFAULT_OPEN_PARENS type CLOSE_PARENS
+       : DEFAULT open_parens_any type CLOSE_PARENS
          {
                if (RootContext.Version < LanguageVersion.ISO_2)
                        Report.FeatureIsNotAvailable (lexer.Location, "default value expression");
 
-               $$ = new DefaultValueExpression ((Expression) $2, lexer.Location);
+               $$ = new DefaultValueExpression ((Expression) $3, GetLocation ($1));
          }
        ;
 
@@ -3703,39 +3753,23 @@ unary_expression
        : primary_expression
        | BANG prefixed_unary_expression
          {
-               $$ = new Unary (Unary.Operator.LogicalNot, (Expression) $2, (Location) $1);
+               $$ = new Unary (Unary.Operator.LogicalNot, (Expression) $2);
          }
        | TILDE prefixed_unary_expression
          {
-               $$ = new Unary (Unary.Operator.OnesComplement, (Expression) $2, (Location) $1);
+               $$ = new Unary (Unary.Operator.OnesComplement, (Expression) $2);
          }
        | cast_expression
        ;
 
-cast_list
-       : parenthesized_expression_0 CLOSE_PARENS_CAST unary_expression
-         {
-               $$ = new Cast ((Expression) $1, (Expression) $3);
-         }
-       | parenthesized_expression_0 CLOSE_PARENS_NO_CAST default_value_expression
+cast_expression
+       : OPEN_PARENS_CAST type CLOSE_PARENS prefixed_unary_expression
          {
-               $$ = new Cast ((Expression) $1, (Expression) $3);
+               $$ = new Cast ((FullNamedExpression) $2, (Expression) $4, GetLocation ($1));
          }
-       | parenthesized_expression_0 CLOSE_PARENS_OPEN_PARENS cast_expression
-         {
-               $$ = new Cast ((Expression) $1, (Expression) $3);
-         }     
-       ;
-
-cast_expression
-       : cast_list
-       | OPEN_PARENS non_expression_type CLOSE_PARENS prefixed_unary_expression
+       | OPEN_PARENS predefined_type CLOSE_PARENS prefixed_unary_expression
          {
-               if ($2 == TypeManager.system_void_expr)
-                       Expression.Error_VoidInvalidInTheContext (GetLocation ($2));
-
-               // TODO: wrong location
-               $$ = new Cast ((Expression) $2, (Expression) $4, lexer.Location);
+               $$ = new Cast ((FullNamedExpression) $2, (Expression) $4, GetLocation ($1));
          }
        ;
 
@@ -3747,29 +3781,27 @@ prefixed_unary_expression
        : unary_expression
        | PLUS prefixed_unary_expression
          { 
-               $$ = new Unary (Unary.Operator.UnaryPlus, (Expression) $2, (Location) $1);
+               $$ = new Unary (Unary.Operator.UnaryPlus, (Expression) $2);
          } 
        | MINUS prefixed_unary_expression 
          { 
-               $$ = new Unary (Unary.Operator.UnaryNegation, (Expression) $2, (Location) $1);
+               $$ = new Unary (Unary.Operator.UnaryNegation, (Expression) $2);
          }
        | OP_INC prefixed_unary_expression 
          {
-               $$ = new UnaryMutator (UnaryMutator.Mode.PreIncrement,
-                                      (Expression) $2, (Location) $1);
+               $$ = new UnaryMutator (UnaryMutator.Mode.PreIncrement, (Expression) $2);
          }
        | OP_DEC prefixed_unary_expression 
          {
-               $$ = new UnaryMutator (UnaryMutator.Mode.PreDecrement,
-                                      (Expression) $2, (Location) $1);
+               $$ = new UnaryMutator (UnaryMutator.Mode.PreDecrement, (Expression) $2);
          }
        | STAR prefixed_unary_expression
          {
-               $$ = new Indirection ((Expression) $2, (Location) $1);
+               $$ = new Indirection ((Expression) $2, GetLocation ($1));
          }
        | BITWISE_AND prefixed_unary_expression
          {
-               $$ = new Unary (Unary.Operator.AddressOf, (Expression) $2, (Location) $1);
+               $$ = new Unary (Unary.Operator.AddressOf, (Expression) $2);
          }
        ;
 
@@ -3801,9 +3833,13 @@ additive_expression
          }
        | additive_expression MINUS multiplicative_expression
          {
-               $$ = new Binary (Binary.Operator.Subtraction, 
-                                (Expression) $1, (Expression) $3);
+               $$ = new Binary (Binary.Operator.Subtraction, (Expression) $1, (Expression) $3);
          }
+       | parenthesized_expression MINUS multiplicative_expression
+         {
+               // Shift/Reduce conflict
+               $$ = new Binary (Binary.Operator.Subtraction, (Expression) $1, (Expression) $3);
+         }
        | additive_expression AS type
          {
                $$ = new As ((Expression) $1, (Expression) $3, (Location) $2);
@@ -3910,29 +3946,23 @@ conditional_or_expression
                                 (Expression) $1, (Expression) $3);
          }
        ;
-
-conditional_expression
+       
+null_coalescing_expression
        : conditional_or_expression
-       | conditional_or_expression INTERR expression COLON expression 
-         {
-               $$ = new Conditional ((Expression) $1, (Expression) $3, (Expression) $5);
-         }
-       | conditional_or_expression OP_COALESCING expression
+       | conditional_or_expression OP_COALESCING null_coalescing_expression
          {
                if (RootContext.Version < LanguageVersion.ISO_2)
                        Report.FeatureIsNotAvailable (GetLocation ($2), "null coalescing operator");
                        
                $$ = new Nullable.NullCoalescingOperator ((Expression) $1, (Expression) $3, lexer.Location);
          }
-       | primary_expression INTERR_NULLABLE opt_rank_specifier
+       ;
+
+conditional_expression
+       : null_coalescing_expression
+       | null_coalescing_expression INTERR expression COLON expression 
          {
-               //
-               // TODO: Is this the best place to handle `= (foo?)a;' ?
-               //
-               if (RootContext.Version < LanguageVersion.ISO_2)
-                       Report.FeatureIsNotAvailable (GetLocation ($1), "nullable types");
-               
-               $$ = new ComposedCast ((FullNamedExpression) $1, "?" + (string)$3, lexer.Location);
+               $$ = new Conditional ((Expression) $1, (Expression) $3, (Expression) $5);
          }
        ;
 
@@ -4035,10 +4065,10 @@ lambda_parameter
        ;
 
 opt_lambda_parameter_list
-       : /* empty */                   { $$ = Parameters.EmptyReadOnlyParameters; }
+       : /* empty */                   { $$ = ParametersCompiled.EmptyReadOnlyParameters; }
        | lambda_parameter_list         { 
                ArrayList pars_list = (ArrayList) $1;
-               $$ = new Parameters ((Parameter[])pars_list.ToArray (typeof (Parameter)));
+               $$ = new ParametersCompiled ((Parameter[])pars_list.ToArray (typeof (Parameter)));
          }
        ;
 
@@ -4062,25 +4092,25 @@ lambda_expression
          {
                LocatedToken lt = (LocatedToken) $1;
                Parameter p = new ImplicitLambdaParameter (lt.Value, lt.Location);
-               start_anonymous (true, new Parameters (p), (Location) $2);
+               start_anonymous (true, new ParametersCompiled (p), GetLocation ($1));
          }
          lambda_expression_body
          {
-               $$ = end_anonymous ((ToplevelBlock) $4, (Location) $2);
+               $$ = end_anonymous ((ToplevelBlock) $4);
          }
        | OPEN_PARENS_LAMBDA opt_lambda_parameter_list CLOSE_PARENS ARROW 
          {
-               start_anonymous (true, (Parameters) $2, (Location) $4);
+               start_anonymous (true, (ParametersCompiled) $2, GetLocation ($1));
          }
          lambda_expression_body 
          {
-               $$ = end_anonymous ((ToplevelBlock) $6, (Location) $4);
+               $$ = end_anonymous ((ToplevelBlock) $6);
          }
        ;
 
 expression
-       : assignment_expression
-       | non_assignment_expression
+       : assignment_expression 
+       | non_assignment_expression 
        ;
        
 non_assignment_expression
@@ -4257,6 +4287,33 @@ type_parameter_constraint
          }
        ;
 
+opt_type_parameter_variance
+       : /* empty */
+         {
+               $$ = Variance.None;
+         }
+       | type_parameter_variance
+         {
+               if (RootContext.MetadataCompatibilityVersion < MetadataVersion.v2)        
+                       Report.FeatureIsNotSupported (lexer.Location, "generic type variance");
+               else if (RootContext.Version <= LanguageVersion.V_3)
+                       Report.FeatureIsNotAvailable (lexer.Location, "generic type variance");
+
+               $$ = $1;
+         }
+       ;
+
+type_parameter_variance
+       : OUT
+         {
+               $$ = Variance.Covariant;
+         }
+       | IN
+         {
+               $$ = Variance.Contravariant;
+         }
+       ;
+
 //
 // Statements (8.2)
 //
@@ -4276,13 +4333,26 @@ block
                ++lexer.parsing_block;
                start_block ((Location) $1);
          } 
-         opt_statement_list CLOSE_BRACE 
+         opt_statement_list block_end
+         {
+               $$ = $4;
+          }
+       ;
+
+block_end 
+       : CLOSE_BRACE 
          {
                --lexer.parsing_block;
-               $$ = end_block ((Location) $4);
+               $$ = end_block ((Location) $1);
+         }
+       | COMPLETE_COMPLETION
+         {
+               --lexer.parsing_block;
+               $$ = end_block (lexer.Location);
          }
        ;
 
+
 block_prepared
        : OPEN_BRACE
          {
@@ -4441,7 +4511,7 @@ declaration_statement
  * > expressions to prevent reduce/reduce errors in the grammar.
  * > The expressions are converted into types during semantic analysis.
  */
-local_variable_type
+variable_type
        : primary_expression_no_array_creation opt_rank_specifier_or_nullable
          { 
                // FIXME: Do something smart here regarding the composition of the type.
@@ -4472,8 +4542,7 @@ local_variable_type
                        //
                        if (rank_or_nullable.Length == 0) {
                                SimpleName sn = expr as SimpleName;
-                               if (sn != null && sn.Name == "var" &&
-                                   (RootContext.Version > LanguageVersion.ISO_2 || RootContext.Version == LanguageVersion.Default_MCS))
+                               if (sn != null && sn.Name == "var" && RootContext.Version > LanguageVersion.ISO_2)
                                        $$ = current_array_type = new VarExpr (sn.Location);
                                else
                                        $$ = $1;
@@ -4513,7 +4582,7 @@ local_variable_pointer_type
          }
        | builtin_types STAR
          {
-               $$ = new ComposedCast ((FullNamedExpression) $1, "*", lexer.Location);
+               $$ = new ComposedCast ((FullNamedExpression) $1, "*", GetLocation ($1));
          }
        | VOID STAR
          {
@@ -4525,6 +4594,23 @@ local_variable_pointer_type
          }
        ;
 
+local_variable_type
+       : variable_type
+       | local_variable_pointer_type opt_rank_specifier
+         {
+               if ($1 != null){
+                       string rank = (string)$2;
+
+                       if (rank == "")
+                               $$ = $1;
+                       else
+                               $$ = current_array_type = new ComposedCast ((FullNamedExpression) $1, rank);
+               } else {
+                       $$ = null;
+               }
+         }
+       ;
+
 local_variable_declaration
        : local_variable_type local_variable_declarators
          {
@@ -4537,23 +4623,10 @@ local_variable_declaration
                } else
                        $$ = null;
          }
-       | local_variable_pointer_type opt_rank_specifier local_variable_declarators
-         {
-               if ($1 != null){
-                       Expression t;
-
-                       if ((string) $2 == "")
-                               t = (Expression) $1;
-                       else
-                               t = new ComposedCast ((FullNamedExpression) $1, (string) $2);
-                       $$ = new DictionaryEntry (t, $3);
-               } else 
-                       $$ = null;
-         }
        ;
 
 local_constant_declaration
-       : CONST local_variable_type constant_declarators
+       : CONST variable_type constant_declarators
          {
                if ($2 != null)
                        $$ = new DictionaryEntry ($2, $3);
@@ -4564,10 +4637,12 @@ local_constant_declaration
 
 expression_statement
        : statement_expression SEMICOLON { $$ = $1; }
+       | statement_expression COMPLETE_COMPLETION { $$ = $1; }
        ;
 
 interactive_expression_statement
        : interactive_statement_expression SEMICOLON { $$ = $1; }
+       | interactive_statement_expression COMPLETE_COMPLETION { $$ = $1; }
        ;
 
        //
@@ -4577,17 +4652,13 @@ interactive_expression_statement
 statement_expression
        : expression
          {
-               Expression expr = (Expression) $1;
-               ExpressionStatement s;
-
-               s = expr as ExpressionStatement;
-
+               ExpressionStatement s = $1 as ExpressionStatement;
                if (s == null) {
-                       expr.Error_InvalidExpressionStatement ();
-                       $$ = null;
-               } else {
-                       $$ = new StatementExpression (s);
+                       ((Expression) $1).Error_InvalidExpressionStatement ();
+                       s = EmptyExpressionStatement.Instance;
                }
+
+               $$ = new StatementExpression (s);
          }
        | error
          {
@@ -4618,7 +4689,7 @@ selection_statement
        ; 
 
 if_statement
-       : IF OPEN_PARENS boolean_expression CLOSE_PARENS 
+       : IF open_parens_any boolean_expression CLOSE_PARENS 
          embedded_statement
          { 
                Location l = (Location) $1;
@@ -4630,7 +4701,7 @@ if_statement
                        Report.Warning (642, 3, l, "Possible mistaken empty statement");
 
          }
-       | IF OPEN_PARENS boolean_expression CLOSE_PARENS
+       | IF open_parens_any boolean_expression CLOSE_PARENS
          embedded_statement ELSE embedded_statement
          {
                Location l = (Location) $1;
@@ -4646,7 +4717,7 @@ if_statement
        ;
 
 switch_statement
-       : SWITCH OPEN_PARENS
+       : SWITCH open_parens_any
          { 
                if (switch_stack == null)
                        switch_stack = new Stack (2);
@@ -4742,7 +4813,7 @@ iteration_statement
        ;
 
 while_statement
-       : WHILE OPEN_PARENS boolean_expression CLOSE_PARENS embedded_statement
+       : WHILE open_parens_any boolean_expression CLOSE_PARENS embedded_statement
          {
                Location l = (Location) $1;
                $$ = new While ((Expression) $3, (Statement) $5, l);
@@ -4751,7 +4822,7 @@ while_statement
 
 do_statement
        : DO embedded_statement 
-         WHILE OPEN_PARENS boolean_expression CLOSE_PARENS SEMICOLON
+         WHILE open_parens_any boolean_expression CLOSE_PARENS SEMICOLON
          {
                Location l = (Location) $1;
 
@@ -4760,8 +4831,7 @@ do_statement
        ;
 
 for_statement
-       : FOR OPEN_PARENS 
-         opt_for_initializer SEMICOLON
+       : FOR open_parens_any opt_for_initializer SEMICOLON
          {
                Location l = lexer.Location;
                start_block (l);  
@@ -4858,12 +4928,12 @@ statement_expression_list
        ;
 
 foreach_statement
-       : FOREACH OPEN_PARENS type IN expression CLOSE_PARENS
+       : FOREACH open_parens_any type IN expression CLOSE_PARENS
          {
                Report.Error (230, (Location) $1, "Type and identifier are both required in a foreach statement");
                $$ = null;
          }
-       | FOREACH OPEN_PARENS type IDENTIFIER IN
+       | FOREACH open_parens_any type IDENTIFIER IN
          expression CLOSE_PARENS 
          {
                start_block (lexer.Location);
@@ -5082,11 +5152,11 @@ opt_catch_args
        ;         
 
 catch_args 
-       : OPEN_PARENS type opt_identifier CLOSE_PARENS 
+       : open_parens_any type opt_identifier CLOSE_PARENS 
          {
                $$ = new DictionaryEntry ($2, $3);
          }
-       | OPEN_PARENS CLOSE_PARENS 
+       | open_parens_any CLOSE_PARENS 
          {
                Report.Error (1015, GetLocation ($1), "A type that derives from `System.Exception', `object', or `string' expected");
          }
@@ -5116,7 +5186,7 @@ unsafe_statement
        ;
 
 fixed_statement
-       : FIXED OPEN_PARENS 
+       : FIXED open_parens_any 
          type_and_void fixed_pointer_declarators 
          CLOSE_PARENS
          {
@@ -5184,7 +5254,7 @@ fixed_pointer_declarator
        ;
 
 lock_statement
-       : LOCK OPEN_PARENS expression CLOSE_PARENS 
+       : LOCK open_parens_any expression CLOSE_PARENS 
          {
                //
          } 
@@ -5195,7 +5265,7 @@ lock_statement
        ;
 
 using_statement
-       : USING OPEN_PARENS local_variable_declaration CLOSE_PARENS
+       : USING open_parens_any local_variable_declaration CLOSE_PARENS
          {
                start_block (lexer.Location);
                Block assign_block = current_block;
@@ -5250,7 +5320,7 @@ using_statement
                current_block.AddStatement (stmt);
                $$ = end_block (lexer.Location);
          }
-       | USING OPEN_PARENS expression CLOSE_PARENS
+       | USING open_parens_any expression CLOSE_PARENS
          {
                start_block (lexer.Location);
          }
@@ -5265,18 +5335,23 @@ using_statement
 // LINQ
 
 query_expression
-       : first_from_clause
+       : first_from_clause query_body
          {
-               ++lexer.query_parsing;
+               lexer.query_parsing = false;
+                       
+               Linq.AQueryClause from = $1 as Linq.AQueryClause;
+                       
+               from.Tail.Next = (Linq.AQueryClause)$2;
+               $$ = from;
+               
+               current_block.SetEndLocation (lexer.Location);
+               current_block = current_block.Parent;
          }
-         query_body
+       | nested_from_clause query_body
          {
-               if (--lexer.query_parsing == 1)
-                       lexer.query_parsing = 0;
-                       
                Linq.AQueryClause from = $1 as Linq.AQueryClause;
                        
-               from.Tail.Next = (Linq.AQueryClause)$3;
+               from.Tail.Next = (Linq.AQueryClause)$2;
                $$ = from;
                
                current_block.SetEndLocation (lexer.Location);
@@ -5285,42 +5360,61 @@ query_expression
        ;
        
 first_from_clause
+       : FROM_FIRST IDENTIFIER IN expression
+         {
+               $$ = new Linq.QueryExpression (current_block, new Linq.QueryStartClause ((Expression)$4));
+               current_block = new Linq.QueryBlock (current_block, (LocatedToken) $2, GetLocation ($1));
+         }
+       | FROM_FIRST type IDENTIFIER IN expression
+         {
+               $$ = new Linq.QueryExpression (current_block, new Linq.Cast ((FullNamedExpression)$2, (Expression)$5));
+               current_block = new Linq.QueryBlock (current_block, (LocatedToken) $3, GetLocation ($1));
+         }
+       ;
+
+nested_from_clause
        : FROM IDENTIFIER IN expression
          {
-               current_block = new Linq.QueryBlock (current_block, GetLocation ($1));
-               LocatedToken lt = (LocatedToken) $2;
-               
-               current_block.AddVariable (Linq.ImplicitQueryParameter.ImplicitType.Instance, lt.Value, lt.Location);
-               $$ = new Linq.QueryExpression (lt, new Linq.QueryStartClause ((Expression)$4));
+               $$ = new Linq.QueryExpression (current_block, new Linq.QueryStartClause ((Expression)$4));
+               current_block = new Linq.QueryBlock (current_block, (LocatedToken) $2, GetLocation ($1));
          }
        | FROM type IDENTIFIER IN expression
          {
-               current_block = new Linq.QueryBlock (current_block, GetLocation ($1));
-               LocatedToken lt = (LocatedToken) $3;
-
-               Expression type = (Expression)$2;
-               current_block.AddVariable (type, lt.Value, lt.Location);
-               $$ = new Linq.QueryExpression (lt, new Linq.Cast (type, (Expression)$5));
+               $$ = new Linq.QueryExpression (current_block, new Linq.Cast ((FullNamedExpression)$2, (Expression)$5));
+               current_block = new Linq.QueryBlock (current_block, (LocatedToken) $3, GetLocation ($1));
          }
        ;
        
 from_clause
-       : FROM IDENTIFIER IN expression
+       : FROM IDENTIFIER IN
+         {
+               current_block = new Linq.QueryBlock (current_block, GetLocation ($1));
+         }
+         expression
          {
                LocatedToken lt = (LocatedToken) $2;
+               $$ = new Linq.SelectMany (current_block.Toplevel, lt, (Expression)$5);
                
-               current_block.AddVariable (Linq.ImplicitQueryParameter.ImplicitType.Instance,
-                       lt.Value, lt.Location);
-                       
-               $$ = new Linq.SelectMany (lt, (Expression)$4);                  
+               current_block.SetEndLocation (lexer.Location);
+               current_block = current_block.Parent;
+               
+               ((Linq.QueryBlock)current_block).AddTransparentParameter (lt);
+         }       
+       | FROM type IDENTIFIER IN
+         {
+               current_block = new Linq.QueryBlock (current_block, GetLocation ($1));
          }
-       | FROM type IDENTIFIER IN expression
+         expression
          {
                LocatedToken lt = (LocatedToken) $3;
-
-               Expression type = (Expression)$2;
-               current_block.AddVariable (type, lt.Value, lt.Location);
-               $$ = new Linq.SelectMany (lt, new Linq.Cast (type, (Expression)$5));
+               FullNamedExpression type = (FullNamedExpression)$2;
+               
+               $$ = new Linq.SelectMany (current_block.Toplevel, lt, new Linq.Cast (type, (FullNamedExpression)$6));
+               
+               current_block.SetEndLocation (lexer.Location);
+               current_block = current_block.Parent;
+               
+               ((Linq.QueryBlock)current_block).AddTransparentParameter (lt);
          }
        ;       
 
@@ -5343,13 +5437,38 @@ query_body
        ;
        
 select_or_group_clause
-       : SELECT expression
+       : SELECT
+         {
+               current_block = new Linq.QueryBlock (current_block, lexer.Location);
+         }
+         expression
+         {
+               $$ = new Linq.Select (current_block.Toplevel, (Expression)$3, GetLocation ($1));
+
+               current_block.SetEndLocation (lexer.Location);
+               current_block = current_block.Parent;
+         }
+       | GROUP
+         {
+               if (linq_clause_blocks == null)
+                       linq_clause_blocks = new Stack ();
+                       
+               current_block = new Linq.QueryBlock (current_block, lexer.Location);
+               linq_clause_blocks.Push (current_block);
+         }
+         expression
          {
-               $$ = new Linq.Select ((Expression)$2, GetLocation ($1));
+               current_block.SetEndLocation (lexer.Location);
+               current_block = current_block.Parent;
+         
+               current_block = new Linq.QueryBlock (current_block, lexer.Location);
          }
-       | GROUP expression BY expression
+         BY expression
          {
-           $$ = new Linq.GroupBy ((Expression)$2, (Expression)$4, GetLocation ($1));
+               $$ = new Linq.GroupBy (current_block.Toplevel, (Expression)$3, (ToplevelBlock) linq_clause_blocks.Pop (), (Expression)$6, GetLocation ($1));
+               
+               current_block.SetEndLocation (lexer.Location);
+               current_block = current_block.Parent;
          }
        ;
        
@@ -5376,54 +5495,130 @@ query_body_clause
        ;
        
 let_clause
-       : LET IDENTIFIER ASSIGN expression
+       : LET IDENTIFIER ASSIGN 
+         {
+               current_block = new Linq.QueryBlock (current_block, GetLocation ($1));
+         }
+         expression
          {
                LocatedToken lt = (LocatedToken) $2;
-               current_block.AddVariable (Linq.ImplicitQueryParameter.ImplicitType.Instance,
-                       lt.Value, lt.Location);   
-               $$ = new Linq.Let (lt, (Expression)$4, GetLocation ($1));
+               $$ = new Linq.Let (current_block.Toplevel, current_container, lt, (Expression)$5);
+               
+               current_block.SetEndLocation (lexer.Location);
+               current_block = current_block.Parent;
+               
+               ((Linq.QueryBlock)current_block).AddTransparentParameter (lt);
          }
        ;
 
 where_clause
-       : WHERE boolean_expression
+       : WHERE
          {
-               $$ = new Linq.Where ((Expression)$2, GetLocation ($1));
+               current_block = new Linq.QueryBlock (current_block, lexer.Location);
+         }
+         boolean_expression
+         {
+               $$ = new Linq.Where (current_block.Toplevel, (Expression)$3, GetLocation ($1));
+
+               current_block.SetEndLocation (lexer.Location);
+               current_block = current_block.Parent;
          }
        ;
        
 join_clause
-       : JOIN IDENTIFIER IN expression ON expression EQUALS expression opt_join_into
+       : JOIN IDENTIFIER IN
+         {
+               if (linq_clause_blocks == null)
+                       linq_clause_blocks = new Stack ();
+                       
+               current_block = new Linq.QueryBlock (current_block, lexer.Location);
+               linq_clause_blocks.Push (current_block);
+         }
+         expression ON
+         {
+               current_block.SetEndLocation (lexer.Location);
+               current_block = current_block.Parent;
+
+               current_block = new Linq.QueryBlock (current_block, lexer.Location);
+               linq_clause_blocks.Push (current_block);
+         }
+         expression EQUALS
+         {
+               current_block.AddStatement (new ContextualReturn ((Expression) $8));
+               current_block.SetEndLocation (lexer.Location);
+               current_block = current_block.Parent;
+
+               current_block = new Linq.QueryBlock (current_block, (LocatedToken) $2, lexer.Location);
+         }
+         expression opt_join_into
          {
-               Location loc = GetLocation ($1);
                LocatedToken lt = (LocatedToken) $2;
-               current_block.AddVariable (Linq.ImplicitQueryParameter.ImplicitType.Instance,
-                       lt.Value, lt.Location);
                
-               if ($9 == null) {
-                       $$ = new Linq.Join (lt, (Expression)$4, (Expression)$6,
-                               (Expression)$8, loc);
+               ToplevelBlock outer_selector = (ToplevelBlock) linq_clause_blocks.Pop ();
+               ToplevelBlock block = (ToplevelBlock) linq_clause_blocks.Pop ();
+
+               if ($12 == null) {
+                       $$ = new Linq.Join (block, lt, (Expression)$5, outer_selector, current_block.Toplevel, GetLocation ($1));
                } else {
-                       LocatedToken lt_into = (LocatedToken) $9;
-                       $$ = new Linq.GroupJoin (lt, (Expression)$4, (Expression)$6,
-                               (Expression)$8, lt_into, loc);
+                       $$ = new Linq.GroupJoin (block, lt, (Expression)$5, outer_selector, current_block.Toplevel,
+                               (LocatedToken) $12, GetLocation ($1));
                }
+
+               current_block.AddStatement (new ContextualReturn ((Expression) $11));
+               current_block.SetEndLocation (lexer.Location);
+               current_block = current_block.Parent;
+                       
+               if ($12 == null)
+                       ((Linq.QueryBlock)current_block).AddTransparentParameter (lt);
+               else
+                       ((Linq.QueryBlock)current_block).AddTransparentParameter ((LocatedToken) $12);
+         }
+       | JOIN type IDENTIFIER IN
+         {
+               if (linq_clause_blocks == null)
+                       linq_clause_blocks = new Stack ();
+                       
+               current_block = new Linq.QueryBlock (current_block, lexer.Location);
+               linq_clause_blocks.Push (current_block);
+         }
+         expression ON
+         {
+               current_block.SetEndLocation (lexer.Location);
+               current_block = current_block.Parent;
+
+               current_block = new Linq.QueryBlock (current_block, lexer.Location);
+               linq_clause_blocks.Push (current_block);
          }
-       | JOIN type IDENTIFIER IN expression ON expression EQUALS expression opt_join_into
+         expression EQUALS
+         {
+               current_block.AddStatement (new ContextualReturn ((Expression) $9));
+               current_block.SetEndLocation (lexer.Location);
+               current_block = current_block.Parent;
+
+               current_block = new Linq.QueryBlock (current_block, (LocatedToken) $3, lexer.Location);
+         }
+         expression opt_join_into
          {
-               Location loc = GetLocation ($1);
                LocatedToken lt = (LocatedToken) $3;
-               current_block.AddVariable ((Expression)$2, lt.Value, lt.Location);
+               ToplevelBlock outer_selector = (ToplevelBlock) linq_clause_blocks.Pop ();
+               ToplevelBlock block = (ToplevelBlock) linq_clause_blocks.Pop ();
                
-               Linq.Cast cast = new Linq.Cast ((Expression)$2, (Expression)$5);
-               if ($10 == null) {
-                       $$ = new Linq.Join (lt, cast, (Expression)$7,
-                               (Expression)$9, loc);
+               Linq.Cast cast = new Linq.Cast ((FullNamedExpression)$2, (Expression)$6);
+               if ($13 == null) {
+                       $$ = new Linq.Join (block, lt, cast, outer_selector, current_block.Toplevel, GetLocation ($1));
                } else {
-                       LocatedToken lt_into = (LocatedToken) $10;
-                       $$ = new Linq.GroupJoin (lt, cast, (Expression)$7,
-                               (Expression)$9, lt_into, loc);
+                       $$ = new Linq.GroupJoin (block, lt, cast, outer_selector, current_block.Toplevel,
+                               (LocatedToken) $13, GetLocation ($1));
                }
+               
+               current_block.AddStatement (new ContextualReturn ((Expression) $12));
+               current_block.SetEndLocation (lexer.Location);
+               current_block = current_block.Parent;
+                       
+               if ($13 == null)
+                       ((Linq.QueryBlock)current_block).AddTransparentParameter (lt);
+               else
+                       ((Linq.QueryBlock)current_block).AddTransparentParameter ((LocatedToken) $13);
          }
        ;
        
@@ -5431,65 +5626,83 @@ opt_join_into
        : /* empty */
        | INTO IDENTIFIER
          {
-               $$ = $2;
+               $$ = $2;
          }
        ;
        
 orderby_clause
-       : ORDERBY orderings
+       : ORDERBY
          {
-               $$ = $2;
+               current_block = new Linq.QueryBlock (current_block, lexer.Location);
+         }
+         orderings
+         {
+               current_block.SetEndLocation (lexer.Location);
+               current_block = current_block.Parent;
+         
+               $$ = $3;
          }
        ;
        
 orderings
        : order_by
-       | order_by COMMA orderings_then_by
+       | order_by COMMA
+         {
+               current_block.SetEndLocation (lexer.Location);
+               current_block = current_block.Parent;
+         
+               current_block = new Linq.QueryBlock (current_block, lexer.Location);
+         }
+         orderings_then_by
          {
-               ((Linq.AQueryClause)$1).Next = (Linq.AQueryClause)$3;
+               ((Linq.AQueryClause)$1).Next = (Linq.AQueryClause)$4;
                $$ = $1;
          }
        ;
        
 orderings_then_by
        : then_by
-         {
-               $$ = $1;
-         }
-       | orderings_then_by COMMA then_by
-         {
+       | orderings_then_by COMMA
+        {
+               current_block.SetEndLocation (lexer.Location);
+               current_block = current_block.Parent;
+         
+               current_block = new Linq.QueryBlock (current_block, lexer.Location);     
+        }
+        then_by
+        {
                ((Linq.AQueryClause)$1).Tail.Next = (Linq.AQueryClause)$3;
                $$ = $1;
-         }
+        }
        ;       
        
 order_by
        : expression
          {
-               $$ = new Linq.OrderByAscending ((Expression)$1);        
+               $$ = new Linq.OrderByAscending (current_block.Toplevel, (Expression)$1);        
          }
        | expression ASCENDING
          {
-               $$ = new Linq.OrderByAscending ((Expression)$1);        
+               $$ = new Linq.OrderByAscending (current_block.Toplevel, (Expression)$1);        
          }
        | expression DESCENDING
          {
-               $$ = new Linq.OrderByDescending ((Expression)$1);       
+               $$ = new Linq.OrderByDescending (current_block.Toplevel, (Expression)$1);       
          }
        ;
 
 then_by
        : expression
          {
-               $$ = new Linq.ThenByAscending ((Expression)$1); 
+               $$ = new Linq.ThenByAscending (current_block.Toplevel, (Expression)$1); 
          }
        | expression ASCENDING
          {
-               $$ = new Linq.ThenByAscending ((Expression)$1); 
+               $$ = new Linq.ThenByAscending (current_block.Toplevel, (Expression)$1); 
          }
        | expression DESCENDING
          {
-               $$ = new Linq.ThenByDescending ((Expression)$1);        
+               $$ = new Linq.ThenByDescending (current_block.Toplevel, (Expression)$1);        
          }     
        ;
 
@@ -5504,16 +5717,12 @@ opt_query_continuation
 
                current_block.SetEndLocation (GetLocation ($1));
                current_block = current_block.Parent;
-               current_block = new Linq.QueryBlock (current_block, GetLocation ($1));
                
-               LocatedToken lt = (LocatedToken) $2;
-               current_block.AddVariable (Linq.ImplicitQueryParameter.ImplicitType.Instance,
-                       lt.Value, lt.Location);
+               current_block = new Linq.QueryBlock (current_block, (LocatedToken) $2, GetLocation ($1));
          }
          query_body
          {
-               $$ = new Linq.QueryExpression ((LocatedToken) $2,
-                       (Linq.AQueryClause)$4);
+               $$ = new Linq.QueryExpression (current_block, (Linq.AQueryClause)$4);
          }
        ;
        
@@ -5547,7 +5756,7 @@ interactive_parsing
                Parameter [] mpar = new Parameter [1];
                mpar [0] = new Parameter (TypeManager.system_object_expr, "$retval", Parameter.Modifier.REF, null, Location.Null);
 
-               Parameters pars = new Parameters (mpar);
+               ParametersCompiled pars = new ParametersCompiled (mpar);
                current_local_parameters = pars;
                Method method = new Method (
                        current_class,
@@ -5562,7 +5771,7 @@ interactive_parsing
                ++lexer.parsing_block;
                start_block (lexer.Location);
          }             
-         interactive_statement_list
+         interactive_statement_list opt_COMPLETE_COMPLETION
          {
                --lexer.parsing_block;
                Method method = (Method) oob_stack.Pop ();
@@ -5586,6 +5795,16 @@ interactive_compilation_unit
        | global_attributes 
        | /* nothing */
        ;
+
+opt_COMPLETE_COMPLETION
+       : /* nothing */
+       | COMPLETE_COMPLETION
+       ;
+
+close_brace_or_complete_completion
+       : CLOSE_BRACE
+       | COMPLETE_COMPLETION
+       ;
 %%
 
 // <summary>
@@ -5981,16 +6200,20 @@ end_block (Location loc)
 }
 
 void
-start_anonymous (bool lambda, Parameters parameters, Location loc)
+start_anonymous (bool lambda, ParametersCompiled parameters, Location loc)
 {
+       if (RootContext.Version == LanguageVersion.ISO_1){
+               Report.FeatureIsNotAvailable (loc, "anonymous methods");
+       }
+
        oob_stack.Push (current_anonymous_method);
        oob_stack.Push (current_local_parameters);
 
        current_local_parameters = parameters;
 
        current_anonymous_method = lambda 
-               ? new LambdaExpression (parameters, loc) 
-               : new AnonymousMethodExpression (parameters, loc);
+               ? new LambdaExpression (loc) 
+               : new AnonymousMethodExpression (loc);
 
        // Force the next block to be created as a ToplevelBlock
        parsing_anonymous_method = true;
@@ -6000,19 +6223,14 @@ start_anonymous (bool lambda, Parameters parameters, Location loc)
  * Completes the anonymous method processing, if lambda_expr is null, this
  * means that we have a Statement instead of an Expression embedded 
  */
-AnonymousMethodExpression end_anonymous (ToplevelBlock anon_block, Location loc)
+AnonymousMethodExpression end_anonymous (ToplevelBlock anon_block)
 {
        AnonymousMethodExpression retval;
 
-       if (RootContext.Version == LanguageVersion.ISO_1){
-               Report.FeatureIsNotAvailable (loc, "anonymous methods");
-               retval = null;
-       } else  {
-               current_anonymous_method.Block = anon_block;
-               retval = current_anonymous_method;
-       }
+       current_anonymous_method.Block = anon_block;
+       retval = current_anonymous_method;
 
-       current_local_parameters = (Parameters) oob_stack.Pop ();
+       current_local_parameters = (ParametersCompiled) oob_stack.Pop ();
        current_anonymous_method = (AnonymousMethodExpression) oob_stack.Pop ();
 
        return retval;
@@ -6027,15 +6245,23 @@ public NamespaceEntry CurrentNamespace {
 
 void Error_SyntaxError (int token)
 {
-       Error_SyntaxError (1525, token);
+       Error_SyntaxError (0, token);
 }
 
 void Error_SyntaxError (int error_code, int token)
 {
        string symbol = GetSymbolName (token);
        string expecting = GetExpecting ();
+       
+       if (error_code == 0) {
+               if (expecting == "`)'")
+                       error_code = 1026;
+               else
+                       error_code = 1525;
+       }
+       
        if (expecting != null)
-               Report.Error (error_code, lexer.Location, "Unexpected symbol `{0}', expecting {1}",
+               Report.Error (error_code, lexer.Location, "Unexpected symbol `{0}', expecting {1}", 
                        symbol, expecting);       
        else
                Report.Error (error_code, lexer.Location, "Unexpected symbol `{0}'", symbol);
@@ -6044,10 +6270,7 @@ void Error_SyntaxError (int error_code, int token)
 string GetExpecting ()
 {
        int [] tokens = yyExpectingTokens (yyExpectingState);
-       if (tokens.Length == 1)
-               return "`" + GetTokenName (tokens [0]) + "'";
-       
-       ArrayList names = new ArrayList ();
+       ArrayList names = new ArrayList (tokens.Length);
        bool has_type = false;
        bool has_identifier = false;
        for (int i = 0; i < tokens.Length; i++){
@@ -6064,7 +6287,7 @@ string GetExpecting ()
                
                names.Add (name);
        }
-       
+
        //
        // Too many tokens to enumerate
        //
@@ -6074,6 +6297,9 @@ string GetExpecting ()
        if (has_type && has_identifier)
                names.Remove ("identifier");
 
+       if (names.Count == 1)
+               return "`" + GetTokenName (tokens [0]) + "'";
+       
        StringBuilder sb = new StringBuilder ();
        names.Sort ();
        int count = names.Count;
@@ -6134,6 +6360,74 @@ string GetSymbolName (int token)
                return "ushort";
        case Token.OBJECT:
                return "object";
+               
+       case Token.PLUS:
+               return "+";
+       case Token.UMINUS:
+       case Token.MINUS:
+               return "-";
+       case Token.BANG:
+               return "!";
+       case Token.BITWISE_AND:
+               return "&";
+       case Token.BITWISE_OR:
+               return "|";
+       case Token.STAR:
+               return "*";
+       case Token.PERCENT:
+               return "%";
+       case Token.DIV:
+               return "/";
+       case Token.CARRET:
+               return "^";
+       case Token.OP_INC:
+               return "++";
+       case Token.OP_DEC:
+               return "--";
+       case Token.OP_SHIFT_LEFT:
+               return "<<";
+       case Token.OP_SHIFT_RIGHT:
+               return ">>";
+       case Token.OP_LT:
+               return "<";
+       case Token.OP_GT:
+               return ">";
+       case Token.OP_LE:
+               return "<=";
+       case Token.OP_GE:
+               return ">=";
+       case Token.OP_EQ:
+               return "==";
+       case Token.OP_NE:
+               return "!=";
+       case Token.OP_AND:
+               return "&&";
+       case Token.OP_OR:
+               return "||";
+       case Token.OP_PTR:
+               return "->";
+       case Token.OP_COALESCING:       
+               return "??";
+       case Token.OP_MULT_ASSIGN:
+               return "*=";
+       case Token.OP_DIV_ASSIGN:
+               return "/=";
+       case Token.OP_MOD_ASSIGN:
+               return "%=";
+       case Token.OP_ADD_ASSIGN:
+               return "+=";
+       case Token.OP_SUB_ASSIGN:
+               return "-=";
+       case Token.OP_SHIFT_LEFT_ASSIGN:
+               return "<<=";
+       case Token.OP_SHIFT_RIGHT_ASSIGN:
+               return ">>=";
+       case Token.OP_AND_ASSIGN:
+               return "&=";
+       case Token.OP_XOR_ASSIGN:
+               return "^=";
+       case Token.OP_OR_ASSIGN:
+               return "|=";
        }
 
        return GetTokenName (token);
@@ -6271,12 +6565,13 @@ static string GetTokenName (int token)
        case Token.WHILE:
                return "while";
        case Token.ARGLIST:
-               return "arglist";
+               return "__arglist";
        case Token.PARTIAL:
                return "partial";
        case Token.ARROW:
                return "=>";
        case Token.FROM:
+       case Token.FROM_FIRST:
                return "from";
        case Token.JOIN:
                return "join";
@@ -6312,14 +6607,10 @@ static string GetTokenName (int token)
                return "[";
        case Token.CLOSE_BRACKET:
                return "]";
-       case Token.DEFAULT_OPEN_PARENS:
+       case Token.OPEN_PARENS_CAST:
        case Token.OPEN_PARENS_LAMBDA:
        case Token.OPEN_PARENS:
                return "(";
-       case Token.CLOSE_PARENS_CAST:
-       case Token.CLOSE_PARENS_NO_CAST:
-       case Token.CLOSE_PARENS_OPEN_PARENS:
-       case Token.CLOSE_PARENS_MINUS:
        case Token.CLOSE_PARENS:
                return ")";
        case Token.DOT:
@@ -6359,8 +6650,6 @@ static string GetTokenName (int token)
        case Token.OP_OR:
        case Token.OP_PTR:
        case Token.OP_COALESCING:       
-               return "<operator>";
-       
        case Token.OP_MULT_ASSIGN:
        case Token.OP_DIV_ASSIGN:
        case Token.OP_MOD_ASSIGN:
@@ -6421,10 +6710,9 @@ static string GetTokenName (int token)
        case Token.EVAL_COMPILATION_UNIT_PARSER:
        case Token.EVAL_USING_DECLARATIONS_UNIT_PARSER:
        case Token.EVAL_STATEMENT_PARSER:
-       case Token.LOWPREC:
-       case Token.QUERY_LAST_TOKEN:
-       case Token.QUERY_FIRST_TOKEN:
-       case Token.LAST_KEYWORD:        
+       case Token.LAST_KEYWORD:
+       case Token.GENERATE_COMPLETION:
+       case Token.COMPLETE_COMPLETION:
                return "<internal>";
 
                // A bit more robust.