Disable unification into current assembly, it's not fully implemented yet
[mono.git] / mcs / mcs / anonymous.cs
index 5724027e71d214596b98b1244033d56a9dddccf3..31f73896fd918fab91033154a9d559c6fe69327d 100644 (file)
 //
 
 using System;
-using System.Text;
-using System.Collections;
-using System.Collections.Specialized;
+using System.Collections.Generic;
+
+#if STATIC
+using IKVM.Reflection;
+using IKVM.Reflection.Emit;
+#else
 using System.Reflection;
 using System.Reflection.Emit;
+#endif
 
 namespace Mono.CSharp {
 
        public abstract class CompilerGeneratedClass : Class
        {
+               protected CompilerGeneratedClass (DeclSpace parent, MemberName name, Modifiers mod)
+                       : base (parent.NamespaceEntry, parent, name, mod | Modifiers.COMPILER_GENERATED, null)
+               {
+               }
+
+               protected void CheckMembersDefined ()
+               {
+                       if (HasMembersDefined)
+                               throw new InternalErrorException ("Helper class already defined!");
+               }
+
+               protected static MemberName MakeMemberName (MemberBase host, string name, int unique_id, TypeParameter[] tparams, Location loc)
+               {
+                       string host_name = host == null ? null : host.Name;
+                       string tname = MakeName (host_name, "c", name, unique_id);
+                       TypeArguments args = null;
+                       if (tparams != null) {
+                               args = new TypeArguments ();
+                               foreach (TypeParameter tparam in tparams)
+                                       args.Add (new TypeParameterName (tparam.Name, null, loc));
+                       }
+
+                       return new MemberName (tname, args, loc);
+               }
+
                public static string MakeName (string host, string typePrefix, string name, int id)
                {
                        return "<" + host + ">" + typePrefix + "__" + name + id.ToString ("X");
                }
-               
-               protected CompilerGeneratedClass (DeclSpace parent, MemberName name, int mod)
-                       : base (parent.NamespaceEntry, parent, name, mod | Modifiers.COMPILER_GENERATED | Modifiers.SEALED, null)
+       }
+
+       public class HoistedStoreyClass : CompilerGeneratedClass
+       {
+               public sealed class HoistedField : Field
                {
+                       public HoistedField (HoistedStoreyClass parent, FullNamedExpression type, Modifiers mod, string name,
+                                 Attributes attrs, Location loc)
+                               : base (parent, type, mod, new MemberName (name, loc), attrs)
+                       {
+                       }
+
+                       protected override bool ResolveMemberType ()
+                       {
+                               if (!base.ResolveMemberType ())
+                                       return false;
+
+                               HoistedStoreyClass parent = ((HoistedStoreyClass) Parent).GetGenericStorey ();
+                               if (parent != null && parent.Mutator != null)
+                                       member_type = parent.Mutator.Mutate (MemberType);
+
+                               return true;
+                       }
                }
 
-               protected CompilerGeneratedClass (DeclSpace parent, GenericMethod generic, MemberName name, int mod)
-                       : this (parent, name, mod)
+               protected TypeParameterMutator mutator;
+
+               public HoistedStoreyClass (DeclSpace parent, MemberName name, TypeParameter[] tparams, Modifiers mod)
+                       : base (parent, name, mod | Modifiers.PRIVATE)
                {
-                       if (generic != null) {
-                               ArrayList list = new ArrayList ();
-                               foreach (TypeParameter tparam in generic.TypeParameters) {
-                                       if (tparam.Constraints != null)
-                                               list.Add (tparam.Constraints.Clone ());
+                       if (tparams != null) {
+                               type_params = new TypeParameter[tparams.Length];
+                               var src = new TypeParameterSpec[tparams.Length];
+                               var dst = new TypeParameterSpec[tparams.Length];
+
+                               for (int i = 0; i < type_params.Length; ++i) {
+                                       type_params[i] = tparams[i].CreateHoistedCopy (this, spec);
+
+                                       src[i] = tparams[i].Type;
+                                       dst[i] = type_params[i].Type;
+                               }
+
+                               // A copy is not enough, inflate any type parameter constraints
+                               // using a new type parameters
+                               var inflator = new TypeParameterInflator (null, src, dst);
+                               for (int i = 0; i < type_params.Length; ++i) {
+                                       src[i].InflateConstraints (inflator, dst[i]);
                                }
-                               SetParameterInfo (list);
                        }
                }
 
-               protected void CheckMembersDefined ()
+               #region Properties
+
+               public TypeParameterMutator Mutator {
+                       get {
+                               return mutator;
+                       }
+                       set {
+                               mutator = value;
+                       }
+               }
+
+               #endregion
+
+               public HoistedStoreyClass GetGenericStorey ()
                {
-                       if (members_defined)
-                               throw new InternalErrorException ("Helper class already defined!");
+                       DeclSpace storey = this;
+                       while (storey != null && storey.CurrentTypeParameters == null)
+                               storey = storey.Parent;
+
+                       return storey as HoistedStoreyClass;
                }
        }
 
+
        //
        // Anonymous method storey is created when an anonymous method uses
        // variable or parameter from outer scope. They are then hoisted to
        // anonymous method storey (captured)
        //
-       public class AnonymousMethodStorey : CompilerGeneratedClass
+       public class AnonymousMethodStorey : HoistedStoreyClass
        {
-               class StoreyFieldPair {
+               struct StoreyFieldPair
+               {
                        public readonly AnonymousMethodStorey Storey;
                        public readonly Field Field;
 
@@ -66,37 +145,6 @@ namespace Mono.CSharp {
                                this.Storey = storey;
                                this.Field = field;
                        }
-
-                       public override int GetHashCode ()
-                       {
-                               return Storey.ID.GetHashCode ();
-                       }
-
-                       public override bool Equals (object obj)
-                       {
-                               return (AnonymousMethodStorey)obj == Storey;
-                       }
-               }
-
-               sealed class HoistedGenericField : Field
-               {
-                       public HoistedGenericField (DeclSpace parent, FullNamedExpression type, int mod, string name,
-                                 Attributes attrs, Location loc)
-                               : base (parent, type, mod, new MemberName (name, loc), attrs)
-                       {
-                       }
-
-                       protected override bool ResolveMemberType ()
-                       {
-                               if (!base.ResolveMemberType ())
-                                       return false;
-
-                               AnonymousMethodStorey parent = ((AnonymousMethodStorey) Parent).GetGenericStorey ();
-                               if (parent != null)
-                                       member_type = parent.MutateType (member_type);
-
-                               return true;
-                       }
                }
 
                //
@@ -123,11 +171,6 @@ namespace Mono.CSharp {
                        {
                                // Nothing to clone
                        }
-
-                       public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
-                       {
-                               // Nothing to mutate
-                       }
                }
 
                // Unique storey ID
@@ -137,12 +180,12 @@ namespace Mono.CSharp {
                public readonly Block OriginalSourceBlock;
 
                // A list of StoreyFieldPair with local field keeping parent storey instance
-               ArrayList used_parent_storeys;
-               ArrayList children_references;
+               List<StoreyFieldPair> used_parent_storeys;
+               List<ExplicitBlock> children_references;
 
                // A list of hoisted parameters
-               protected ArrayList hoisted_params;
-               protected ArrayList hoisted_locals;
+               protected List<HoistedParameter> hoisted_params;
+               protected List<HoistedVariable> hoisted_locals;
 
                // Hoisted this
                protected HoistedThis hoisted_this;
@@ -150,37 +193,33 @@ namespace Mono.CSharp {
                // Local variable which holds this storey instance
                public LocalTemporary Instance;
 
-               public AnonymousMethodStorey (Block block, TypeContainer parent, MemberBase host, GenericMethod generic, string name)
-                       : base (parent, generic, MakeMemberName (host, name, generic, block.StartLocation), Modifiers.PRIVATE)
+               public AnonymousMethodStorey (Block block, TypeContainer parent, MemberBase host, TypeParameter[] tparams, string name)
+                       : base (parent, MakeMemberName (host, name, unique_id, tparams, block.StartLocation),
+                               tparams, Modifiers.SEALED)
                {
                        Parent = parent;
                        OriginalSourceBlock = block;
                        ID = unique_id++;
                }
 
-               static MemberName MakeMemberName (MemberBase host, string name, GenericMethod generic, Location loc)
-               {
-                       string host_name = host == null ? null : host.Name;
-                       string tname = MakeName (host_name, "c", name, unique_id);
-                       TypeArguments args = null;
-                       if (generic != null) {
-                               args = new TypeArguments ();
-                               foreach (TypeParameter tparam in generic.CurrentTypeParameters)
-                                       args.Add (new TypeParameterName (tparam.Name, null, loc));
-                       }
-
-                       return new MemberName (tname, args, loc);
-               }
-
                public void AddCapturedThisField (EmitContext ec)
                {
                        TypeExpr type_expr = new TypeExpression (ec.CurrentType, Location);
                        Field f = AddCompilerGeneratedField ("<>f__this", type_expr);
                        f.Define ();
                        hoisted_this = new HoistedThis (this, f);
+
+                       // Inflated type instance has to be updated manually
+                       if (Instance.Type is InflatedTypeSpec) {
+                               var inflator = new TypeParameterInflator (Instance.Type, TypeParameterSpec.EmptyTypes, TypeSpec.EmptyTypes);
+                               Instance.Type.MemberCache.AddMember (f.Spec.InflateMember (inflator));
+
+                               inflator = new TypeParameterInflator (f.Parent.CurrentType, TypeParameterSpec.EmptyTypes, TypeSpec.EmptyTypes);
+                               f.Parent.CurrentType.MemberCache.AddMember (f.Spec.InflateMember (inflator));
+                       }
                }
 
-               public Field AddCapturedVariable (string name, Type type)
+               public Field AddCapturedVariable (string name, TypeSpec type)
                {
                        CheckMembersDefined ();
 
@@ -188,22 +227,22 @@ namespace Mono.CSharp {
                        if (!IsGeneric)
                                return AddCompilerGeneratedField (name, field_type);
 
-                       const int mod = Modifiers.INTERNAL | Modifiers.COMPILER_GENERATED;
-                       Field f = new HoistedGenericField (this, field_type, mod, name, null, Location);
+                       const Modifiers mod = Modifiers.INTERNAL | Modifiers.COMPILER_GENERATED;
+                       Field f = new HoistedField (this, field_type, mod, name, null, Location);
                        AddField (f);
                        return f;
                }
 
                protected Field AddCompilerGeneratedField (string name, FullNamedExpression type)
                {
-                       const int mod = Modifiers.INTERNAL | Modifiers.COMPILER_GENERATED;
+                       const Modifiers mod = Modifiers.INTERNAL | Modifiers.COMPILER_GENERATED;
                        Field f = new Field (this, type, mod, new MemberName (name, Location), null);
                        AddField (f);
                        return f;
                }
 
                //
-               // Creates a link between block and the anonymous method storey
+               // Creates a link between hoisted variable block and the anonymous method storey
                //
                // An anonymous method can reference variables from any outer block, but they are
                // hoisted in their own ExplicitBlock. When more than one block is referenced we
@@ -212,45 +251,45 @@ namespace Mono.CSharp {
                public void AddReferenceFromChildrenBlock (ExplicitBlock block)
                {
                        if (children_references == null)
-                               children_references = new ArrayList ();
+                               children_references = new List<ExplicitBlock> ();
 
                        if (!children_references.Contains (block))
                                children_references.Add (block);
                }
 
-               public void AddParentStoreyReference (AnonymousMethodStorey storey)
+               public void AddParentStoreyReference (EmitContext ec, AnonymousMethodStorey storey)
                {
                        CheckMembersDefined ();
 
                        if (used_parent_storeys == null)
-                               used_parent_storeys = new ArrayList ();
-                       else if (used_parent_storeys.IndexOf (storey) != -1)
+                               used_parent_storeys = new List<StoreyFieldPair> ();
+                       else if (used_parent_storeys.Exists (i => i.Storey == storey))
                                return;
 
-                       TypeExpr type_expr = new TypeExpression (storey.TypeBuilder, Location);
+                       TypeExpr type_expr = storey.CreateStoreyTypeExpression (ec);
                        Field f = AddCompilerGeneratedField ("<>f__ref$" + storey.ID, type_expr);
                        used_parent_storeys.Add (new StoreyFieldPair (storey, f));
                }
 
-               public void CaptureLocalVariable (EmitContext ec, LocalInfo local_info)
+               public void CaptureLocalVariable (ResolveContext ec, LocalVariable local_info)
                {
                        ec.CurrentBlock.Explicit.HasCapturedVariable = true;
                        if (ec.CurrentBlock.Explicit != local_info.Block.Explicit)
                                AddReferenceFromChildrenBlock (ec.CurrentBlock.Explicit);
 
-                       if (local_info.HoistedVariableReference != null)
+                       if (local_info.HoistedVariant != null)
                                return;
 
                        HoistedVariable var = new HoistedLocalVariable (this, local_info, GetVariableMangledName (local_info));
-                       local_info.HoistedVariableReference = var;
+                       local_info.HoistedVariant = var;
 
                        if (hoisted_locals == null)
-                               hoisted_locals = new ArrayList ();
+                               hoisted_locals = new List<HoistedVariable> ();
 
                        hoisted_locals.Add (var);
                }
 
-               public void CaptureParameter (EmitContext ec, ParameterReference param_ref)
+               public void CaptureParameter (ResolveContext ec, ParameterReference param_ref)
                {
                        ec.CurrentBlock.Explicit.HasCapturedVariable = true;
                        AddReferenceFromChildrenBlock (ec.CurrentBlock.Explicit);
@@ -259,35 +298,20 @@ namespace Mono.CSharp {
                                return;
 
                        if (hoisted_params == null)
-                               hoisted_params = new ArrayList (2);
+                               hoisted_params = new List<HoistedParameter> (2);
 
-                       HoistedVariable expr = new HoistedParameter (this, param_ref);
-                       param_ref.Parameter.HoistedVariableReference = expr;
+                       var expr = new HoistedParameter (this, param_ref);
+                       param_ref.Parameter.HoistedVariant = expr;
                        hoisted_params.Add (expr);
                }
 
-               public void ChangeParentStorey (AnonymousMethodStorey parentStorey)
-               {
-                       Parent = parentStorey;
-                       type_params = null;
-               }
-
-               //
-               // Initializes all hoisted variables
-               //
-               public void EmitStoreyInstantiation (EmitContext ec)
+               TypeExpr CreateStoreyTypeExpression (EmitContext ec)
                {
-                       // There can be only one instance variable for each storey type
-                       if (Instance != null)
-                               throw new InternalErrorException ();
-
-                       SymbolWriter.OpenCompilerGeneratedBlock (ec.ig);
-
                        //
                        // Create an instance of storey type
                        //
-                       Expression storey_type_expr;
-                       if (is_generic) {
+                       TypeExpr storey_type_expr;
+                       if (CurrentTypeParameters != null) {
                                //
                                // Use current method type parameter (MVAR) for top level storey only. All
                                // nested storeys use class type parameter (VAR)
@@ -298,34 +322,93 @@ namespace Mono.CSharp {
 
                                TypeArguments targs = new TypeArguments ();
 
-                               if (tparams.Length < CountTypeParameters) {
-                                       TypeParameter[] parent_tparams = ec.MemberContext.CurrentTypeDefinition.TypeParameters;
-                                       for (int i = 0; i < parent_tparams.Length; ++i)
-                                               targs.Add (new TypeParameterExpr (parent_tparams[i], Location));
-                               }
-                               
+                               //
+                               // Use type parameter name instead of resolved type parameter
+                               // specification to resolve to correctly nested type parameters
+                               //
                                for (int i = 0; i < tparams.Length; ++i)
-                                       targs.Add (new TypeParameterExpr (tparams[i], Location));
+                                       targs.Add (new SimpleName (tparams [i].Name, Location)); //  new TypeParameterExpr (tparams[i], Location));
 
-                               storey_type_expr = new GenericTypeExpr (TypeBuilder, targs, Location);
+                               storey_type_expr = new GenericTypeExpr (Definition, targs, Location);
                        } else {
-                               storey_type_expr = new TypeExpression (TypeBuilder, Location);
+                               storey_type_expr = new TypeExpression (CurrentType, Location);
+                       }
+
+                       return storey_type_expr;
+               }
+
+               public void SetNestedStoryParent (AnonymousMethodStorey parentStorey)
+               {
+                       Parent = parentStorey;
+                       type_params = null;
+                       spec.IsGeneric = false;
+                       spec.DeclaringType = parentStorey.CurrentType;
+                       MemberName.TypeArguments = null;
+               }
+
+               protected override bool DoResolveTypeParameters ()
+               {
+                       // Although any storey can have type parameters they are all clones of method type
+                       // parameters therefore have to mutate MVAR references in any of cloned constraints
+                       if (type_params != null) {
+                               for (int i = 0; i < type_params.Length; ++i) {
+                                       var spec = type_params[i].Type;
+                                       spec.BaseType = mutator.Mutate (spec.BaseType);
+                                       if (spec.InterfacesDefined != null) {
+                                               var mutated = new TypeSpec[spec.InterfacesDefined.Length];
+                                               for (int ii = 0; ii < mutated.Length; ++ii) {
+                                                       mutated[ii] = mutator.Mutate (spec.InterfacesDefined[ii]);
+                                               }
+
+                                               spec.InterfacesDefined = mutated;
+                                       }
+
+                                       if (spec.TypeArguments != null) {
+                                               spec.TypeArguments = mutator.Mutate (spec.TypeArguments);
+                                       }
+                               }
                        }
 
-                       ResolveContext rc = new ResolveContext (this);
+                       //
+                       // Update parent cache as we most likely passed the point
+                       // where the cache was constructed
+                       //
+                       Parent.CurrentType.MemberCache.AddMember (this.spec);
+
+                       return true;
+               }
+
+               //
+               // Initializes all hoisted variables
+               //
+               public void EmitStoreyInstantiation (EmitContext ec, ExplicitBlock block)
+               {
+                       // There can be only one instance variable for each storey type
+                       if (Instance != null)
+                               throw new InternalErrorException ();
+
+                       SymbolWriter.OpenCompilerGeneratedBlock (ec);
+
+                       //
+                       // Create an instance of a storey
+                       //
+                       var storey_type_expr = CreateStoreyTypeExpression (ec);
+
+                       ResolveContext rc = new ResolveContext (ec.MemberContext);
+                       rc.CurrentBlock = block;
                        Expression e = new New (storey_type_expr, null, Location).Resolve (rc);
                        e.Emit (ec);
 
                        Instance = new LocalTemporary (storey_type_expr.Type);
                        Instance.Store (ec);
 
-                       EmitHoistedFieldsInitialization (ec);
+                       EmitHoistedFieldsInitialization (rc, ec);
 
                        SymbolWriter.DefineScopeVariable (ID, Instance.Builder);
-                       SymbolWriter.CloseCompilerGeneratedBlock (ec.ig);
+                       SymbolWriter.CloseCompilerGeneratedBlock (ec);
                }
 
-               void EmitHoistedFieldsInitialization (EmitContext ec)
+               void EmitHoistedFieldsInitialization (ResolveContext rc, EmitContext ec)
                {
                        //
                        // Initialize all storey reference fields by using local or hoisted variables
@@ -333,16 +416,18 @@ namespace Mono.CSharp {
                        if (used_parent_storeys != null) {
                                foreach (StoreyFieldPair sf in used_parent_storeys) {
                                        //
-                                       // Setting local field
+                                       // Get instance expression of storey field
                                        //
                                        Expression instace_expr = GetStoreyInstanceExpression (ec);
-                                       FieldExpr f_set_expr = TypeManager.IsGenericType (instace_expr.Type) ?
-                                               new FieldExpr (sf.Field.FieldBuilder, instace_expr.Type, Location) :
-                                               new FieldExpr (sf.Field.FieldBuilder, Location);
+                                       var fs = sf.Field.Spec;
+                                       if (TypeManager.IsGenericType (instace_expr.Type))
+                                               fs = MemberCache.GetMember (instace_expr.Type, fs);
+
+                                       FieldExpr f_set_expr = new FieldExpr (fs, Location);
                                        f_set_expr.InstanceExpression = instace_expr;
 
                                        SimpleAssign a = new SimpleAssign (f_set_expr, sf.Storey.GetStoreyInstanceExpression (ec));
-                                       if (a.Resolve (new ResolveContext (ec.MemberContext)) != null)
+                                       if (a.Resolve (rc) != null)
                                                a.EmitStatement (ec);
                                }
                        }
@@ -352,7 +437,7 @@ namespace Mono.CSharp {
                        //
                        if (OriginalSourceBlock.Explicit.HasCapturedThis && !(Parent is AnonymousMethodStorey)) {
                                AddCapturedThisField (ec);
-                               OriginalSourceBlock.AddScopeStatement (new ThisInitializer (hoisted_this));
+                               rc.CurrentBlock.AddScopeStatement (new ThisInitializer (hoisted_this));
                        }
 
                        //
@@ -368,7 +453,7 @@ namespace Mono.CSharp {
                        ec.CurrentAnonymousMethod = ae;
                }
 
-               protected virtual void EmitHoistedParameters (EmitContext ec, ArrayList hoisted)
+               protected virtual void EmitHoistedParameters (EmitContext ec, IList<HoistedParameter> hoisted)
                {
                        foreach (HoistedParameter hp in hoisted) {
                                hp.EmitHoistingAssignment (ec);
@@ -401,15 +486,6 @@ namespace Mono.CSharp {
                        base.EmitType ();
                }
 
-               public AnonymousMethodStorey GetGenericStorey ()
-               {
-                       DeclSpace storey = this;
-                       while (storey != null && storey.CurrentTypeParameters == null)
-                               storey = storey.Parent;
-
-                       return storey as AnonymousMethodStorey;
-               }
-
                //
                // Returns a field which holds referenced storey instance
                //
@@ -451,7 +527,7 @@ namespace Mono.CSharp {
                                        //
                                        // Access inside of same storey (S -> S)
                                        //
-                                       return new CompilerGeneratedThis (TypeBuilder, Location);
+                                       return new CompilerGeneratedThis (CurrentType, Location);
                                }
                                //
                                // External field access
@@ -462,12 +538,12 @@ namespace Mono.CSharp {
                        //
                        // Storey was cached to local field
                        //
-                       FieldExpr f_ind = new FieldExpr (f.FieldBuilder, Location);
-                       f_ind.InstanceExpression = new CompilerGeneratedThis (TypeBuilder, Location);
+                       FieldExpr f_ind = new FieldExpr (f, Location);
+                       f_ind.InstanceExpression = new CompilerGeneratedThis (CurrentType, Location);
                        return f_ind;
                }
 
-               protected virtual string GetVariableMangledName (LocalInfo local_info)
+               protected virtual string GetVariableMangledName (LocalVariable local_info)
                {
                        //
                        // No need to mangle anonymous method hoisted variables cause they
@@ -480,137 +556,7 @@ namespace Mono.CSharp {
                        get { return hoisted_this; }
                }
 
-               //
-               // Mutate type dispatcher
-               //
-               public Type MutateType (Type type)
-               {
-#if GMCS_SOURCE
-                       if (TypeManager.IsGenericType (type))
-                               return MutateGenericType (type);
-
-                       if (TypeManager.IsGenericParameter (type))
-                               return MutateGenericArgument (type);
-
-                       if (type.IsArray)
-                               return MutateArrayType (type);
-#endif
-                       return type;
-               }
-
-               //
-               // Changes method type arguments (MVAR) to storey (VAR) type arguments
-               //
-               public MethodInfo MutateGenericMethod (MethodInfo method)
-               {
-#if GMCS_SOURCE
-                       Type [] t_args = TypeManager.GetGenericArguments (method);
-                       if (TypeManager.IsGenericType (method.DeclaringType)) {
-                               Type t = MutateGenericType (method.DeclaringType);
-                               if (t != method.DeclaringType) {
-                                       method = (MethodInfo) TypeManager.DropGenericMethodArguments (method);
-                                       if (method.Module == Module.Builder)
-                                               method = TypeBuilder.GetMethod (t, method);
-                                       else
-                                               method = (MethodInfo) MethodInfo.GetMethodFromHandle (method.MethodHandle, t.TypeHandle);
-                               }                               
-                       }
-
-                       if (t_args == null || t_args.Length == 0)
-                               return method;
-
-                       for (int i = 0; i < t_args.Length; ++i)
-                               t_args [i] = MutateType (t_args [i]);
-
-                       return method.GetGenericMethodDefinition ().MakeGenericMethod (t_args);
-#else
-                       throw new NotSupportedException ();
-#endif
-               }
-
-               public ConstructorInfo MutateConstructor (ConstructorInfo ctor)
-               {
-#if GMCS_SOURCE                
-                       if (TypeManager.IsGenericType (ctor.DeclaringType)) {
-                               Type t = MutateGenericType (ctor.DeclaringType);
-                               if (t != ctor.DeclaringType) {
-                                       ctor = (ConstructorInfo) TypeManager.DropGenericMethodArguments (ctor);
-                                       if (ctor.Module == Module.Builder)
-                                               return TypeBuilder.GetConstructor (t, ctor);
-                                               
-                                       return (ConstructorInfo) ConstructorInfo.GetMethodFromHandle (ctor.MethodHandle, t.TypeHandle);
-                               }
-                       }
-#endif
-                       return ctor;
-               }
-               
-               public FieldInfo MutateField (FieldInfo field)
-               {
-#if GMCS_SOURCE
-                       if (TypeManager.IsGenericType (field.DeclaringType)) {
-                               Type t = MutateGenericType (field.DeclaringType);
-                               if (t != field.DeclaringType) {
-                                       field = TypeManager.DropGenericTypeArguments (field.DeclaringType).GetField (field.Name, TypeManager.AllMembers);
-                                       if (field.Module == Module.Builder)
-                                               return TypeBuilder.GetField (t, field);
-
-                                       return FieldInfo.GetFieldFromHandle (field.FieldHandle, t.TypeHandle);                                          
-                               }
-                       }
-#endif
-                       return field;
-               }               
-
-#if GMCS_SOURCE
-               protected Type MutateArrayType (Type array)
-               {
-                       Type element = TypeManager.GetElementType (array);
-                       if (element.IsArray) {
-                               element = MutateArrayType (element);
-                       } else if (TypeManager.IsGenericParameter (element)) {
-                               element = MutateGenericArgument (element);
-                       } else if (TypeManager.IsGenericType (element)) {
-                               element = MutateGenericType (element);
-                       } else {
-                               return array;
-                       }
-
-                       int rank = array.GetArrayRank ();
-                       if (rank == 1)
-                               return element.MakeArrayType ();
-
-                       return element.MakeArrayType (rank);
-               }
-
-               protected Type MutateGenericType (Type type)
-               {
-                       Type [] t_args = TypeManager.GetTypeArguments (type);
-                       if (t_args == null || t_args.Length == 0)
-                               return type;
-
-                       for (int i = 0; i < t_args.Length; ++i)
-                               t_args [i] = MutateType (t_args [i]);
-
-                       return TypeManager.DropGenericTypeArguments (type).MakeGenericType (t_args);
-               }
-#endif
-
-               //
-               // Changes method generic argument (MVAR) to type generic argument (VAR)
-               //
-               public Type MutateGenericArgument (Type type)
-               {
-                       if (CurrentTypeParameters != null) {
-                               TypeParameter tp = TypeParameter.FindTypeParameter (CurrentTypeParameters, type.Name);
-                               if (tp != null)
-                                       return tp.Type;
-                       }
-
-                       return type;
-               }
-
-               public ArrayList ReferencesFromChildrenBlock {
+               public IList<ExplicitBlock> ReferencesFromChildrenBlock {
                        get { return children_references; }
                }
 
@@ -622,24 +568,29 @@ namespace Mono.CSharp {
 
        public abstract class HoistedVariable
        {
-               class ExpressionTreeProxy : Expression
+               //
+               // Hoisted version of variable references used in expression
+               // tree has to be delayed until we know its location. The variable
+               // doesn't know its location until all stories are calculated
+               //
+               class ExpressionTreeVariableReference : Expression
                {
                        readonly HoistedVariable hv;
 
-                       public ExpressionTreeProxy (HoistedVariable hv)
+                       public ExpressionTreeVariableReference (HoistedVariable hv)
                        {
                                this.hv = hv;
                        }
 
                        public override Expression CreateExpressionTree (ResolveContext ec)
                        {
-                               throw new NotSupportedException ("ET");
+                               return hv.CreateExpressionTree ();
                        }
 
-                       public override Expression DoResolve (ResolveContext ec)
+                       protected override Expression DoResolve (ResolveContext ec)
                        {
                                eclass = ExprClass.Value;
-                               type = TypeManager.expression_type_expr.Type;
+                               type = ec.Module.PredefinedTypes.Expression.Resolve (Location);
                                return this;
                        }
 
@@ -656,10 +607,10 @@ namespace Mono.CSharp {
        
                protected readonly AnonymousMethodStorey storey;
                protected Field field;
-               Hashtable cached_inner_access; // TODO: Hashtable is too heavyweight
+               Dictionary<AnonymousExpression, FieldExpr> cached_inner_access; // TODO: Hashtable is too heavyweight
                FieldExpr cached_outer_access;
 
-               protected HoistedVariable (AnonymousMethodStorey storey, string name, Type type)
+               protected HoistedVariable (AnonymousMethodStorey storey, string name, TypeSpec type)
                        : this (storey, storey.AddCapturedVariable (name, type))
                {
                }
@@ -675,9 +626,9 @@ namespace Mono.CSharp {
                        GetFieldExpression (ec).AddressOf (ec, mode);
                }
 
-               public Expression CreateExpressionTree (ResolveContext ec)
+               public Expression CreateExpressionTree ()
                {
-                       return new ExpressionTreeProxy (this);
+                       return new ExpressionTreeVariableReference (this);
                }
 
                public void Emit (EmitContext ec)
@@ -688,7 +639,7 @@ namespace Mono.CSharp {
                //
                // Creates field access expression for hoisted variable
                //
-               protected FieldExpr GetFieldExpression (EmitContext ec)
+               protected virtual FieldExpr GetFieldExpression (EmitContext ec)
                {
                        if (ec.CurrentAnonymousMethod == null || ec.CurrentAnonymousMethod.Storey == null) {
                                if (cached_outer_access != null)
@@ -698,9 +649,12 @@ namespace Mono.CSharp {
                                // When setting top-level hoisted variable in generic storey
                                // change storey generic types to method generic types (VAR -> MVAR)
                                //
-                               cached_outer_access = storey.MemberName.IsGeneric ?
-                                       new FieldExpr (field.FieldBuilder, storey.Instance.Type, field.Location) :
-                                       new FieldExpr (field.FieldBuilder, field.Location);
+                               if (storey.Instance.Type.IsGenericOrParentIsGeneric) {
+                                       var fs = MemberCache.GetMember (storey.Instance.Type, field.Spec);
+                                       cached_outer_access = new FieldExpr (fs, field.Location);
+                               } else {
+                                       cached_outer_access = new FieldExpr (field, field.Location);
+                               }
 
                                cached_outer_access.InstanceExpression = storey.GetStoreyInstanceExpression (ec);
                                return cached_outer_access;
@@ -708,17 +662,21 @@ namespace Mono.CSharp {
 
                        FieldExpr inner_access;
                        if (cached_inner_access != null) {
-                               inner_access = (FieldExpr) cached_inner_access [ec.CurrentAnonymousMethod];
+                               if (!cached_inner_access.TryGetValue (ec.CurrentAnonymousMethod, out inner_access))
+                                       inner_access = null;
                        } else {
                                inner_access = null;
-                               cached_inner_access = new Hashtable (4);
+                               cached_inner_access = new Dictionary<AnonymousExpression, FieldExpr> (4);
                        }
 
                        if (inner_access == null) {
-                               inner_access = field.Parent.MemberName.IsGeneric ?
-                                       new FieldExpr (field.FieldBuilder, field.Parent.CurrentType, field.Location) :
-                                       new FieldExpr (field.FieldBuilder, field.Location);
-                                                       
+                               if (field.Parent.IsGeneric) {
+                                       var fs = MemberCache.GetMember (field.Parent.CurrentType, field.Spec);
+                                       inner_access = new FieldExpr (fs, field.Location);
+                               } else {
+                                       inner_access = new FieldExpr (field, field.Location);
+                               }
+
                                inner_access.InstanceExpression = storey.GetStoreyInstanceExpression (ec);
                                cached_inner_access.Add (ec.CurrentAnonymousMethod, inner_access);
                        }
@@ -739,7 +697,7 @@ namespace Mono.CSharp {
                }
        }
 
-       class HoistedParameter : HoistedVariable
+       public class HoistedParameter : HoistedVariable
        {
                sealed class HoistedFieldAssign : Assign
                {
@@ -777,14 +735,14 @@ namespace Mono.CSharp {
                        //
                        // Remove hoisted redirection to emit assignment from original parameter
                        //
-                       HoistedVariable temp = parameter.Parameter.HoistedVariableReference;
-                       parameter.Parameter.HoistedVariableReference = null;
+                       HoistedVariable temp = parameter.Parameter.HoistedVariant;
+                       parameter.Parameter.HoistedVariant = null;
 
                        Assign a = new HoistedFieldAssign (GetFieldExpression (ec), parameter);
                        if (a.Resolve (new ResolveContext (ec.MemberContext)) != null)
                                a.EmitStatement (ec);
 
-                       parameter.Parameter.HoistedVariableReference = temp;
+                       parameter.Parameter.HoistedVariant = temp;
                }
 
                public override void EmitSymbolInfo ()
@@ -801,8 +759,8 @@ namespace Mono.CSharp {
        {
                readonly string name;
 
-               public HoistedLocalVariable (AnonymousMethodStorey scope, LocalInfo local, string name)
-                       : base (scope, name, local.VariableType)
+               public HoistedLocalVariable (AnonymousMethodStorey scope, LocalVariable local, string name)
+                       : base (scope, name, local.Type)
                {
                        this.name = local.Name;
                }
@@ -842,13 +800,42 @@ namespace Mono.CSharp {
        //
        public class AnonymousMethodExpression : Expression
        {
-               ListDictionary compatibles;
-               public ToplevelBlock Block;
+               //
+               // Special conversion for nested expression tree lambdas
+               //
+               class Quote : ShimExpression
+               {
+                       public Quote (Expression expr)
+                               : base (expr)
+                       {
+                       }
+
+                       public override Expression CreateExpressionTree (ResolveContext ec)
+                       {
+                               var args = new Arguments (1);
+                               args.Add (new Argument (expr.CreateExpressionTree (ec)));
+                               return CreateExpressionFactoryCall (ec, "Quote", args);
+                       }
+
+                       protected override Expression DoResolve (ResolveContext rc)
+                       {
+                               expr = expr.Resolve (rc);
+                               if (expr == null)
+                                       return null;
+
+                               eclass = expr.eclass;
+                               type = expr.Type;
+                               return this;
+                       }
+               }
+
+               Dictionary<TypeSpec, Expression> compatibles;
+               public ParametersBlock Block;
 
                public AnonymousMethodExpression (Location loc)
                {
                        this.loc = loc;
-                       this.compatibles = new ListDictionary ();
+                       this.compatibles = new Dictionary<TypeSpec, Expression> ();
                }
 
                public override string ExprClassName {
@@ -871,55 +858,55 @@ namespace Mono.CSharp {
                // Returns true if the body of lambda expression can be implicitly
                // converted to the delegate of type `delegate_type'
                //
-               public bool ImplicitStandardConversionExists (ResolveContext ec, Type delegate_type)
+               public bool ImplicitStandardConversionExists (ResolveContext ec, TypeSpec delegate_type)
                {
-                       using (ec.With (EmitContext.Options.InferReturnType, false)) {
-                               using (ec.Set (EmitContext.Options.ProbingMode)) {
+                       using (ec.With (ResolveContext.Options.InferReturnType, false)) {
+                               using (ec.Set (ResolveContext.Options.ProbingMode)) {
                                        return Compatible (ec, delegate_type) != null;
                                }
                        }
                }
 
-               protected Type CompatibleChecks (ResolveContext ec, Type delegate_type)
+               TypeSpec CompatibleChecks (ResolveContext ec, TypeSpec delegate_type)
                {
-                       if (TypeManager.IsDelegateType (delegate_type))
+                       if (delegate_type.IsDelegate)
                                return delegate_type;
 
-                       if (TypeManager.DropGenericTypeArguments (delegate_type) == TypeManager.expression_type) {
-                               delegate_type = TypeManager.GetTypeArguments (delegate_type) [0];
-                               if (TypeManager.IsDelegateType (delegate_type))
+                       if (delegate_type.IsGeneric && delegate_type.GetDefinition () == TypeManager.expression_type) {
+                               delegate_type = delegate_type.TypeArguments [0];
+                               if (delegate_type.IsDelegate)
                                        return delegate_type;
 
-                               Report.Error (835, loc, "Cannot convert `{0}' to an expression tree of non-delegate type `{1}'",
+                               ec.Report.Error (835, loc, "Cannot convert `{0}' to an expression tree of non-delegate type `{1}'",
                                        GetSignatureForError (), TypeManager.CSharpName (delegate_type));
                                return null;
                        }
 
-                       Report.Error (1660, loc, "Cannot convert `{0}' to non-delegate type `{1}'",
+                       ec.Report.Error (1660, loc, "Cannot convert `{0}' to non-delegate type `{1}'",
                                      GetSignatureForError (), TypeManager.CSharpName (delegate_type));
                        return null;
                }
 
-               protected bool VerifyExplicitParameters (Type delegate_type, AParametersCollection parameters, bool ignore_error)
+               protected bool VerifyExplicitParameters (ResolveContext ec, TypeSpec delegate_type, AParametersCollection parameters)
                {
-                       if (VerifyParameterCompatibility (delegate_type, parameters, ignore_error))
+                       if (VerifyParameterCompatibility (ec, delegate_type, parameters, ec.IsInProbingMode))
                                return true;
 
-                       if (!ignore_error)
-                               Report.Error (1661, loc,
+                       if (!ec.IsInProbingMode)
+                               ec.Report.Error (1661, loc,
                                        "Cannot convert `{0}' to delegate type `{1}' since there is a parameter mismatch",
                                        GetSignatureForError (), TypeManager.CSharpName (delegate_type));
 
                        return false;
                }
 
-               protected bool VerifyParameterCompatibility (Type delegate_type, AParametersCollection invoke_pd, bool ignore_errors)
+               protected bool VerifyParameterCompatibility (ResolveContext ec, TypeSpec delegate_type, AParametersCollection invoke_pd, bool ignore_errors)
                {
                        if (Parameters.Count != invoke_pd.Count) {
                                if (ignore_errors)
                                        return false;
                                
-                               Report.Error (1593, loc, "Delegate `{0}' does not take `{1}' arguments",
+                               ec.Report.Error (1593, loc, "Delegate `{0}' does not take `{1}' arguments",
                                              TypeManager.CSharpName (delegate_type), Parameters.Count.ToString ());
                                return false;
                        }
@@ -934,10 +921,10 @@ namespace Mono.CSharp {
                                                return false;
                                        
                                        if (p_mod == Parameter.Modifier.NONE)
-                                               Report.Error (1677, loc, "Parameter `{0}' should not be declared with the `{1}' keyword",
+                                               ec.Report.Error (1677, loc, "Parameter `{0}' should not be declared with the `{1}' keyword",
                                                              (i + 1).ToString (), Parameter.GetModifierSignature (Parameters.FixedParameters [i].ModFlags));
                                        else
-                                               Report.Error (1676, loc, "Parameter `{0}' must be declared with the `{1}' keyword",
+                                               ec.Report.Error (1676, loc, "Parameter `{0}' must be declared with the `{1}' keyword",
                                                              (i+1).ToString (), Parameter.GetModifierSignature (p_mod));
                                        error = true;
                                }
@@ -945,7 +932,7 @@ namespace Mono.CSharp {
                                if (has_implicit_parameters)
                                        continue;
 
-                               Type type = invoke_pd.Types [i];
+                               TypeSpec type = invoke_pd.Types [i];
                                
                                // We assume that generic parameters are always inflated
                                if (TypeManager.IsGenericParameter (type))
@@ -954,11 +941,11 @@ namespace Mono.CSharp {
                                if (TypeManager.HasElementType (type) && TypeManager.IsGenericParameter (TypeManager.GetElementType (type)))
                                        continue;
                                
-                               if (invoke_pd.Types [i] != Parameters.Types [i]) {
+                               if (!TypeSpecComparer.IsEqual (invoke_pd.Types [i], Parameters.Types [i])) {
                                        if (ignore_errors)
                                                return false;
                                        
-                                       Report.Error (1678, loc, "Parameter `{0}' is declared as type `{1}' but should be `{2}'",
+                                       ec.Report.Error (1678, loc, "Parameter `{0}' is declared as type `{1}' but should be `{2}'",
                                                      (i+1).ToString (),
                                                      TypeManager.CSharpName (Parameters.Types [i]),
                                                      TypeManager.CSharpName (invoke_pd.Types [i]));
@@ -972,26 +959,26 @@ namespace Mono.CSharp {
                //
                // Infers type arguments based on explicit arguments
                //
-               public bool ExplicitTypeInference (TypeInferenceContext type_inference, Type delegate_type)
+               public bool ExplicitTypeInference (ResolveContext ec, TypeInferenceContext type_inference, TypeSpec delegate_type)
                {
                        if (!HasExplicitParameters)
                                return false;
 
-                       if (!TypeManager.IsDelegateType (delegate_type)) {
-                               if (TypeManager.DropGenericTypeArguments (delegate_type) != TypeManager.expression_type)
+                       if (!delegate_type.IsDelegate) {
+                               if (delegate_type.GetDefinition () != TypeManager.expression_type)
                                        return false;
 
                                delegate_type = TypeManager.GetTypeArguments (delegate_type) [0];
-                               if (!TypeManager.IsDelegateType (delegate_type))
+                               if (!delegate_type.IsDelegate)
                                        return false;
                        }
                        
-                       AParametersCollection d_params = TypeManager.GetDelegateParameters (delegate_type);
+                       AParametersCollection d_params = Delegate.GetParameters (ec.Compiler, delegate_type);
                        if (d_params.Count != Parameters.Count)
                                return false;
 
                        for (int i = 0; i < Parameters.Count; ++i) {
-                               Type itype = d_params.Types [i];
+                               TypeSpec itype = d_params.Types [i];
                                if (!TypeManager.IsGenericParameter (itype)) {
                                        if (!TypeManager.HasElementType (itype))
                                                continue;
@@ -1004,16 +991,26 @@ namespace Mono.CSharp {
                        return true;
                }
 
-               public Type InferReturnType (ResolveContext ec, TypeInferenceContext tic, Type delegate_type)
+               public TypeSpec InferReturnType (ResolveContext ec, TypeInferenceContext tic, TypeSpec delegate_type)
                {
-                       AnonymousMethodBody am;
-                       using (ec.Set (EmitContext.Options.ProbingMode | EmitContext.Options.InferReturnType)) {
-                               am = CompatibleMethod (ec, tic, InternalType.Arglist, delegate_type);
+                       Expression expr;
+                       AnonymousExpression am;
+
+                       if (compatibles.TryGetValue (delegate_type, out expr)) {
+                               am = expr as AnonymousExpression;
+                               return am == null ? null : am.ReturnType;
                        }
-                       
+
+                       using (ec.Set (ResolveContext.Options.ProbingMode | ResolveContext.Options.InferReturnType)) {
+                               am = CompatibleMethodBody (ec, tic, InternalType.Arglist, delegate_type);
+                               if (am != null)
+                                       am = am.Compatible (ec);
+                       }
+
                        if (am == null)
                                return null;
 
+//                     compatibles.Add (delegate_type, am);
                        return am.ReturnType;
                }
 
@@ -1021,13 +1018,13 @@ namespace Mono.CSharp {
                // Returns AnonymousMethod container if this anonymous method
                // expression can be implicitly converted to the delegate type `delegate_type'
                //
-               public Expression Compatible (ResolveContext ec, Type type)
+               public Expression Compatible (ResolveContext ec, TypeSpec type)
                {
-                       Expression am = (Expression) compatibles [type];
-                       if (am != null)
+                       Expression am;
+                       if (compatibles.TryGetValue (type, out am))
                                return am;
 
-                       Type delegate_type = CompatibleChecks (ec, type);
+                       TypeSpec delegate_type = CompatibleChecks (ec, type);
                        if (delegate_type == null)
                                return null;
 
@@ -1036,15 +1033,8 @@ namespace Mono.CSharp {
                        // needed for the anonymous method.  We create the method here.
                        //
 
-                       MethodInfo invoke_mb = Delegate.GetInvokeMethod (
-                               ec.CurrentType, delegate_type);
-                       Type return_type = TypeManager.TypeToCoreType (invoke_mb.ReturnType);
-
-#if MS_COMPATIBLE
-                       Type[] g_args = delegate_type.GetGenericArguments ();
-                       if (return_type.IsGenericParameter)
-                               return_type = g_args [return_type.GenericParameterPosition];
-#endif
+                       var invoke_mb = Delegate.GetInvokeMethod (ec.Compiler, delegate_type);
+                       TypeSpec return_type = invoke_mb.ReturnType;
 
                        //
                        // Second: the return type of the delegate must be compatible with 
@@ -1053,37 +1043,70 @@ namespace Mono.CSharp {
                        // to be the delegate type return type.
                        //
 
-                       try {
-                               int errors = Report.Errors;
-                               am = CompatibleMethod (ec, null, return_type, delegate_type);
-                               if (am != null && delegate_type != type && errors == Report.Errors)
-                                       am = CreateExpressionTree (ec, delegate_type);
+                       var body = CompatibleMethodBody (ec, null, return_type, delegate_type);
+                       if (body == null)
+                               return null;
 
-                               if (!ec.IsInProbingMode)
-                                       compatibles.Add (type, am == null ? EmptyExpression.Null : am);
+                       bool etree_conversion = delegate_type != type;
 
-                               return am;
-                       } catch (CompletionResult){
+                       try {
+                               if (etree_conversion) {
+                                       if (ec.HasSet (ResolveContext.Options.ExpressionTreeConversion)) {
+                                               //
+                                               // Nested expression tree lambda use same scope as parent
+                                               // lambda, this also means no variable capturing between this
+                                               // and parent scope
+                                               //
+                                               am = body.Compatible (ec, ec.CurrentAnonymousMethod);
+
+                                               //
+                                               // Quote nested expression tree
+                                               //
+                                               if (am != null)
+                                                       am = new Quote (am);
+                                       } else {
+                                               int errors = ec.Report.Errors;
+
+                                               using (ec.Set (ResolveContext.Options.ExpressionTreeConversion)) {
+                                                       am = body.Compatible (ec);
+                                               }
+
+                                               //
+                                               // Rewrite expressions into expression tree when targeting Expression<T>
+                                               //
+                                               if (am != null && errors == ec.Report.Errors)
+                                                       am = CreateExpressionTree (ec, delegate_type);
+                                       }
+                               } else {
+                                       am = body.Compatible (ec);
+                               }
+                       } catch (CompletionResult) {
                                throw;
                        } catch (Exception e) {
                                throw new InternalErrorException (e, loc);
                        }
+
+                       if (!ec.IsInProbingMode) {
+                               compatibles.Add (type, am ?? EmptyExpression.Null);
+                       }
+
+                       return am;
                }
 
-               protected virtual Expression CreateExpressionTree (ResolveContext ec, Type delegate_type)
+               protected virtual Expression CreateExpressionTree (ResolveContext ec, TypeSpec delegate_type)
                {
                        return CreateExpressionTree (ec);
                }
 
                public override Expression CreateExpressionTree (ResolveContext ec)
                {
-                       Report.Error (1946, loc, "An anonymous method cannot be converted to an expression tree");
+                       ec.Report.Error (1946, loc, "An anonymous method cannot be converted to an expression tree");
                        return null;
                }
 
-               protected virtual ParametersCompiled ResolveParameters (ResolveContext ec, TypeInferenceContext tic, Type delegate_type)
+               protected virtual ParametersCompiled ResolveParameters (ResolveContext ec, TypeInferenceContext tic, TypeSpec delegate_type)
                {
-                       AParametersCollection delegate_parameters = TypeManager.GetDelegateParameters (delegate_type);
+                       var delegate_parameters = Delegate.GetParameters (ec.Compiler, delegate_type);
 
                        if (Parameters == ParametersCompiled.Undefined) {
                                //
@@ -1094,32 +1117,33 @@ namespace Mono.CSharp {
                                for (int i = 0; i < delegate_parameters.Count; i++) {
                                        Parameter.Modifier i_mod = delegate_parameters.FixedParameters [i].ModFlags;
                                        if (i_mod == Parameter.Modifier.OUT) {
-                                               Report.Error (1688, loc, "Cannot convert anonymous " +
-                                                                 "method block without a parameter list " +
-                                                                 "to delegate type `{0}' because it has " +
-                                                                 "one or more `out' parameters.",
-                                                                 TypeManager.CSharpName (delegate_type));
+                                               if (!ec.IsInProbingMode) {
+                                                       ec.Report.Error (1688, loc,
+                                                               "Cannot convert anonymous method block without a parameter list to delegate type `{0}' because it has one or more `out' parameters",
+                                                               delegate_type.GetSignatureForError ());
+                                               }
+
                                                return null;
                                        }
                                        fixedpars[i] = new Parameter (
-                                               null, null,
+                                               new TypeExpression (delegate_parameters.Types [i], loc), null,
                                                delegate_parameters.FixedParameters [i].ModFlags, null, loc);
                                }
 
                                return ParametersCompiled.CreateFullyResolved (fixedpars, delegate_parameters.Types);
                        }
 
-                       if (!VerifyExplicitParameters (delegate_type, delegate_parameters, ec.IsInProbingMode)) {
+                       if (!VerifyExplicitParameters (ec, delegate_type, delegate_parameters)) {
                                return null;
                        }
 
                        return Parameters;
                }
 
-               public override Expression DoResolve (ResolveContext ec)
+               protected override Expression DoResolve (ResolveContext ec)
                {
-                       if (ec.HasSet (EmitContext.Options.ConstantScope)) {
-                               Report.Error (1706, loc, "Anonymous methods and lambda expressions cannot be used in the current context");
+                       if (ec.HasSet (ResolveContext.Options.ConstantScope)) {
+                               ec.Report.Error (1706, loc, "Anonymous methods and lambda expressions cannot be used in the current context");
                                return null;
                        }
 
@@ -1136,7 +1160,7 @@ namespace Mono.CSharp {
                        // 
                        type = InternalType.AnonymousMethod;
 
-                       if ((Parameters != null) && !Parameters.Resolve (ec))
+                       if (!DoResolveParameters (ec))
                                return null;
 
                        // FIXME: The emitted code isn't very careful about reachability
@@ -1148,14 +1172,19 @@ namespace Mono.CSharp {
                        return this;
                }
 
+               protected virtual bool DoResolveParameters (ResolveContext rc)
+               {
+                       return Parameters.Resolve (rc);
+               }
+
                public override void Emit (EmitContext ec)
                {
                        // nothing, as we only exist to not do anything.
                }
 
-               public static void Error_AddressOfCapturedVar (IVariableReference var, Location loc)
+               public static void Error_AddressOfCapturedVar (ResolveContext ec, IVariableReference var, Location loc)
                {
-                       Report.Error (1686, loc,
+                       ec.Report.Error (1686, loc,
                                "Local variable or parameter `{0}' cannot have their address taken and be used inside an anonymous method or lambda expression",
                                var.Name);
                }
@@ -1165,22 +1194,19 @@ namespace Mono.CSharp {
                        return ExprClassName;
                }
 
-               protected AnonymousMethodBody CompatibleMethod (ResolveContext ec, TypeInferenceContext tic, Type return_type, Type delegate_type)
+               AnonymousMethodBody CompatibleMethodBody (ResolveContext ec, TypeInferenceContext tic, TypeSpec return_type, TypeSpec delegate_type)
                {
                        ParametersCompiled p = ResolveParameters (ec, tic, delegate_type);
                        if (p == null)
                                return null;
 
-                       ToplevelBlock b = ec.IsInProbingMode ? (ToplevelBlock) Block.PerformClone () : Block;
+                       ParametersBlock b = ec.IsInProbingMode ? (ParametersBlock) Block.PerformClone () : Block;
 
-                       AnonymousMethodBody anonymous = CompatibleMethodFactory (return_type, delegate_type, p, b);
-                       if (!anonymous.Compatible (ec))
-                               return null;
+                       return CompatibleMethodFactory (return_type, delegate_type, p, b);
 
-                       return anonymous;
                }
 
-               protected virtual AnonymousMethodBody CompatibleMethodFactory (Type return_type, Type delegate_type, ParametersCompiled p, ToplevelBlock b)
+               protected virtual AnonymousMethodBody CompatibleMethodFactory (TypeSpec return_type, TypeSpec delegate_type, ParametersCompiled p, ParametersBlock b)
                {
                        return new AnonymousMethodBody (p, b, return_type, delegate_type, loc);
                }
@@ -1189,7 +1215,7 @@ namespace Mono.CSharp {
                {
                        AnonymousMethodExpression target = (AnonymousMethodExpression) t;
 
-                       target.Block = (ToplevelBlock) clonectx.LookupBlock (Block);
+                       target.Block = (ParametersBlock) clonectx.LookupBlock (Block);
                }
        }
 
@@ -1206,7 +1232,7 @@ namespace Mono.CSharp {
 
                        public AnonymousMethodMethod (DeclSpace parent, AnonymousExpression am, AnonymousMethodStorey storey,
                                                          GenericMethod generic, TypeExpr return_type,
-                                                         int mod, string real_name, MemberName name,
+                                                         Modifiers mod, string real_name, MemberName name,
                                                          ParametersCompiled parameters)
                                : base (parent, generic, return_type, mod | Modifiers.COMPILER_GENERATED,
                                                name, parameters, null)
@@ -1216,32 +1242,39 @@ namespace Mono.CSharp {
                                this.RealName = real_name;
 
                                Parent.PartialContainer.AddMethod (this);
-                               Block = am.Block;
+                               Block = new ToplevelBlock (am.block, parameters);
                        }
 
                        public override EmitContext CreateEmitContext (ILGenerator ig)
                        {
                                EmitContext ec = new EmitContext (this, ig, ReturnType);
                                ec.CurrentAnonymousMethod = AnonymousMethod;
+                               if (AnonymousMethod.return_label != null) {
+                                       ec.HasReturnLabel = true;
+                                       ec.ReturnLabel = (Label) AnonymousMethod.return_label;
+                               }
+
                                return ec;
                        }
 
+                       protected override void DefineTypeParameters ()
+                       {
+                               // Type parameters were cloned
+                       }
+
                        protected override bool ResolveMemberType ()
                        {
                                if (!base.ResolveMemberType ())
                                        return false;
 
-                               if (Storey != null && Storey.IsGeneric) {
-                                       AnonymousMethodStorey gstorey = Storey.GetGenericStorey ();
-                                       if (gstorey != null) {
-                                               if (!Parameters.IsEmpty) {
-                                                       Type [] ptypes = Parameters.Types;
-                                                       for (int i = 0; i < ptypes.Length; ++i)
-                                                               ptypes [i] = gstorey.MutateType (ptypes [i]);
-                                               }
-
-                                               member_type = gstorey.MutateType (member_type);
+                               if (Storey != null && Storey.Mutator != null) {
+                                       if (!parameters.IsEmpty) {
+                                               var mutated = Storey.Mutator.Mutate (parameters.Types);
+                                               if (mutated != parameters.Types)
+                                                       parameters = ParametersCompiled.CreateFullyResolved ((Parameter[]) parameters.FixedParameters, mutated);
                                        }
+
+                                       member_type = Storey.Mutator.Mutate (member_type);
                                }
 
                                return true;
@@ -1249,17 +1282,6 @@ namespace Mono.CSharp {
 
                        public override void Emit ()
                        {
-                               //
-                               // Before emitting any code we have to change all MVAR references to VAR
-                               // when the method is of generic type and has hoisted variables
-                               //
-                               if (Storey == Parent && Storey.IsGeneric) {
-                                       AnonymousMethodStorey gstorey = Storey.GetGenericStorey ();
-                                       if (gstorey != null) {
-                                               block.MutateHoistedGenericType (gstorey);
-                                       }
-                               }
-
                                if (MethodBuilder == null) {
                                        Define ();
                                }
@@ -1273,17 +1295,16 @@ namespace Mono.CSharp {
                        }
                }
 
-               //
-               // The block that makes up the body for the anonymous method
-               //
-               protected readonly ToplevelBlock Block;
+               protected ParametersBlock block;
+
+               public TypeSpec ReturnType;
 
-               public Type ReturnType;
+               object return_label;
 
-               protected AnonymousExpression (ToplevelBlock block, Type return_type, Location loc)
+               protected AnonymousExpression (ParametersBlock block, TypeSpec return_type, Location loc)
                {
                        this.ReturnType = return_type;
-                       this.Block = block;
+                       this.block = block;
                        this.loc = loc;
                }
 
@@ -1291,59 +1312,79 @@ namespace Mono.CSharp {
                public abstract bool IsIterator { get; }
                public abstract AnonymousMethodStorey Storey { get; }
 
-               public bool Compatible (ResolveContext ec)
+               public AnonymousExpression Compatible (ResolveContext ec)
                {
+                       return Compatible (ec, this);
+               }
+
+               public AnonymousExpression Compatible (ResolveContext ec, AnonymousExpression ae)
+               {
+                       if (block.Resolved)
+                               return this;
+
                        // TODO: Implement clone
-                       BlockContext aec = new BlockContext (ec.MemberContext, Block, ReturnType);
-                       aec.CurrentAnonymousMethod = this;
+                       BlockContext aec = new BlockContext (ec, block, ReturnType);
+                       aec.CurrentAnonymousMethod = ae;
+
+                       ResolveContext.Options flags = 0;
 
-                       IDisposable aec_dispose = null;
-                       EmitContext.Options flags = 0;
-                       if (ec.HasSet (EmitContext.Options.InferReturnType)) {
-                               flags |= EmitContext.Options.InferReturnType;
-                               aec.ReturnTypeInference = new TypeInferenceContext ();
+                       var am = this as AnonymousMethodBody;
+
+                       if (ec.HasSet (ResolveContext.Options.InferReturnType) && am != null) {
+                               am.ReturnTypeInference = new TypeInferenceContext ();
                        }
 
                        if (ec.IsInProbingMode)
-                               flags |= EmitContext.Options.ProbingMode;
+                               flags |= ResolveContext.Options.ProbingMode;
 
-                       if (ec.HasSet (EmitContext.Options.FieldInitializerScope))
-                               flags |= EmitContext.Options.FieldInitializerScope;
+                       if (ec.HasSet (ResolveContext.Options.FieldInitializerScope))
+                               flags |= ResolveContext.Options.FieldInitializerScope;
 
-                       if (ec.IsUnsafe)
-                               flags |= EmitContext.Options.UnsafeScope;
+                       if (ec.HasSet (ResolveContext.Options.ExpressionTreeConversion))
+                               flags |= ResolveContext.Options.ExpressionTreeConversion;
 
-                       // HACK: Flag with 0 cannot be set 
-                       if (flags != 0)
-                               aec_dispose = aec.Set (flags);
+                       aec.Set (flags);
 
-                       bool res = Block.Resolve (ec.CurrentBranching, aec, Block.Parameters, null);
+                       var errors = ec.Report.Errors;
 
-                       if (ec.HasSet (EmitContext.Options.InferReturnType)) {
-                               aec.ReturnTypeInference.FixAllTypes ();
-                               ReturnType = aec.ReturnTypeInference.InferredTypeArguments [0];
-                       }
+                       bool res = Block.Resolve (ec.CurrentBranching, aec, null);
+
+                       if (aec.HasReturnLabel)
+                               return_label = aec.ReturnLabel;
 
-                       if (aec_dispose != null) {
-                               aec_dispose.Dispose ();
+                       if (am != null && am.ReturnTypeInference != null) {
+                               am.ReturnTypeInference.FixAllTypes (ec);
+                               ReturnType = am.ReturnTypeInference.InferredTypeArguments [0];
+                               am.ReturnTypeInference = null;
                        }
 
-                       return res;
+                       if (res && errors != ec.Report.Errors)
+                               return null;
+
+                       return res ? this : null;
                }
 
                public void SetHasThisAccess ()
                {
-                       Block.HasCapturedThis = true;
-                       ExplicitBlock b = Block.Parent.Explicit;
-
-                       while (b != null) {
+                       ExplicitBlock b = block;
+                       do {
                                if (b.HasCapturedThis)
                                        return;
 
                                b.HasCapturedThis = true;
                                b = b.Parent == null ? null : b.Parent.Explicit;
+                       } while (b != null);
+               }
+
+               //
+               // The block that makes up the body for the anonymous method
+               //
+               public ParametersBlock Block {
+                       get {
+                               return block;
                        }
                }
+
        }
 
        public class AnonymousMethodBody : AnonymousExpression
@@ -1354,11 +1395,12 @@ namespace Mono.CSharp {
                AnonymousMethodMethod method;
                Field am_cache;
                string block_name;
+               TypeInferenceContext return_inference;
 
                static int unique_id;
 
                public AnonymousMethodBody (ParametersCompiled parameters,
-                                       ToplevelBlock block, Type return_type, Type delegate_type,
+                                       ParametersBlock block, TypeSpec return_type, TypeSpec delegate_type,
                                        Location loc)
                        : base (block, return_type, loc)
                {
@@ -1366,27 +1408,40 @@ namespace Mono.CSharp {
                        this.parameters = parameters;
                }
 
+               #region Properties
+
                public override string ContainerType {
                        get { return "anonymous method"; }
                }
 
+               public override bool IsIterator {
+                       get { return false; }
+               }
+
+               public TypeInferenceContext ReturnTypeInference {
+                       get {
+                               return return_inference;
+                       }
+                       set {
+                               return_inference = value;
+                       }
+               }
+
                public override AnonymousMethodStorey Storey {
                        get { return storey; }
                }
 
-               public override bool IsIterator {
-                       get { return false; }
-               }
+               #endregion
 
                public override Expression CreateExpressionTree (ResolveContext ec)
                {
-                       Report.Error (1945, loc, "An expression tree cannot contain an anonymous method expression");
+                       ec.Report.Error (1945, loc, "An expression tree cannot contain an anonymous method expression");
                        return null;
                }
 
                bool Define (ResolveContext ec)
                {
-                       if (!Block.Resolved && !Compatible (ec))
+                       if (!Block.Resolved && Compatible (ec) == null)
                                return false;
 
                        if (block_name == null) {
@@ -1410,7 +1465,7 @@ namespace Mono.CSharp {
                        // 3, an instance method in compiler generated storey when any hoisted variable exists
                        //
 
-                       int modifiers;
+                       Modifiers modifiers;
                        if (Block.HasCapturedVariable || Block.HasCapturedThis) {
                                storey = FindBestMethodStorey ();
                                modifiers = storey != null ? Modifiers.INTERNAL : Modifiers.PRIVATE;
@@ -1421,7 +1476,7 @@ namespace Mono.CSharp {
                                modifiers = Modifiers.STATIC | Modifiers.PRIVATE;
                        }
 
-                       TypeContainer parent = storey != null ? storey : ec.CurrentTypeDefinition;
+                       TypeContainer parent = storey != null ? storey : ec.CurrentTypeDefinition.Parent.PartialContainer;
 
                        MemberCore mc = ec.MemberContext as MemberCore;
                        string name = CompilerGeneratedClass.MakeName (parent != storey ? block_name : null,
@@ -1429,18 +1484,17 @@ namespace Mono.CSharp {
 
                        MemberName member_name;
                        GenericMethod generic_method;
-                       if (storey == null && mc.MemberName.IsGeneric) {
+                       if (storey == null && mc.MemberName.TypeArguments != null) {
                                member_name = new MemberName (name, mc.MemberName.TypeArguments.Clone (), Location);
 
-                               generic_method = new GenericMethod (parent.NamespaceEntry, parent, member_name,
-                                       new TypeExpression (ReturnType, Location), parameters);
-
-                               ArrayList list = new ArrayList ();
-                               foreach (TypeParameter tparam in ec.CurrentTypeParameters) {
-                                       if (tparam.Constraints != null)
-                                               list.Add (tparam.Constraints.Clone ());
+                               var hoisted_tparams = ec.CurrentTypeParameters;
+                               var type_params = new TypeParameter[hoisted_tparams.Length];
+                               for (int i = 0; i < type_params.Length; ++i) {
+                                       type_params[i] = hoisted_tparams[i].CreateHoistedCopy (null, null);
                                }
-                               generic_method.SetParameterInfo (list);
+
+                               generic_method = new GenericMethod (parent.NamespaceEntry, parent, member_name, type_params,
+                                       new TypeExpression (ReturnType, Location), parameters);
                        } else {
                                member_name = new MemberName (name, Location);
                                generic_method = null;
@@ -1455,12 +1509,10 @@ namespace Mono.CSharp {
                                real_name, member_name, parameters);
                }
 
-               public override Expression DoResolve (ResolveContext ec)
+               protected override Expression DoResolve (ResolveContext ec)
                {
-                       if (eclass == ExprClass.Invalid) {
-                               if (!Define (ec))
-                                       return null;
-                       }
+                       if (!Define (ec))
+                               return null;
 
                        eclass = ExprClass.Value;
                        return this;
@@ -1489,7 +1541,9 @@ namespace Mono.CSharp {
                                if (!method.MemberName.IsGeneric) {
                                        TypeContainer parent = method.Parent.PartialContainer;
                                        int id = parent.Fields == null ? 0 : parent.Fields.Count;
-                                       am_cache = new Field (parent, new TypeExpression (type, loc),
+                                       var cache_type = storey != null && storey.Mutator != null ? storey.Mutator.Mutate (type) : type;
+
+                                       am_cache = new Field (parent, new TypeExpression (cache_type, loc),
                                                Modifiers.STATIC | Modifiers.PRIVATE | Modifiers.COMPILER_GENERATED,
                                                new MemberName (CompilerGeneratedClass.MakeName (null, "f", "am$cache", id), loc), null);
                                        am_cache.Define ();
@@ -1516,12 +1570,11 @@ namespace Mono.CSharp {
                                }
                        }
 
-                       ILGenerator ig = ec.ig;
-                       Label l_initialized = ig.DefineLabel ();
+                       Label l_initialized = ec.DefineLabel ();
 
                        if (am_cache != null) {
-                               ig.Emit (OpCodes.Ldsfld, am_cache.FieldBuilder);
-                               ig.Emit (OpCodes.Brtrue_S, l_initialized);
+                               ec.Emit (OpCodes.Ldsfld, am_cache.Spec);
+                               ec.Emit (OpCodes.Brtrue_S, l_initialized);
                        }
 
                        //
@@ -1529,49 +1582,44 @@ namespace Mono.CSharp {
                        //
 
                        if (is_static) {
-                               ig.Emit (OpCodes.Ldnull);
+                               ec.Emit (OpCodes.Ldnull);
                        } else if (storey != null) {
                                Expression e = storey.GetStoreyInstanceExpression (ec).Resolve (new ResolveContext (ec.MemberContext));
                                if (e != null)
                                        e.Emit (ec);
                        } else {
-                               ig.Emit (OpCodes.Ldarg_0);
+                               ec.Emit (OpCodes.Ldarg_0);
                        }
 
-                       MethodInfo delegate_method = method.MethodBuilder;
+                       var delegate_method = method.Spec;
                        if (storey != null && storey.MemberName.IsGeneric) {
-                               Type t = storey.Instance.Type;
-                               
+                               TypeSpec t = storey.Instance.Type;
+
                                //
                                // Mutate anonymous method instance type if we are in nested
                                // hoisted generic anonymous method storey
                                //
                                if (ec.CurrentAnonymousMethod != null &&
                                        ec.CurrentAnonymousMethod.Storey != null &&
-                                       ec.CurrentAnonymousMethod.Storey.IsGeneric) {
-                                       t = storey.GetGenericStorey ().MutateType (t);
+                                       ec.CurrentAnonymousMethod.Storey.Mutator != null) {
+                                       t = storey.Mutator.Mutate (t);
                                }
 
-#if GMCS_SOURCE
-                               delegate_method = TypeBuilder.GetMethod (t, delegate_method);
-#else
-                               throw new NotSupportedException ();
-#endif
-                       }
+                               ec.Emit (OpCodes.Ldftn, TypeBuilder.GetMethod (t.GetMetaInfo (), (MethodInfo) delegate_method.GetMetaInfo ()));
+                       } else {
+                               if (delegate_method.IsGeneric)
+                                       delegate_method = delegate_method.MakeGenericMethod (method.TypeParameters);
 
-                       ig.Emit (OpCodes.Ldftn, delegate_method);
+                               ec.Emit (OpCodes.Ldftn, delegate_method);
+                       }
 
-                       ConstructorInfo constructor_method = Delegate.GetConstructor (ec.CurrentType, type);
-#if MS_COMPATIBLE
-            if (type.IsGenericType && type is TypeBuilder)
-                constructor_method = TypeBuilder.GetConstructor (type, constructor_method);
-#endif
-                       ig.Emit (OpCodes.Newobj, constructor_method);
+                       var constructor_method = Delegate.GetConstructor (ec.MemberContext.Compiler, ec.CurrentType, type);
+                       ec.Emit (OpCodes.Newobj, constructor_method);
 
                        if (am_cache != null) {
-                               ig.Emit (OpCodes.Stsfld, am_cache.FieldBuilder);
-                               ig.MarkLabel (l_initialized);
-                               ig.Emit (OpCodes.Ldsfld, am_cache.FieldBuilder);
+                               ec.Emit (OpCodes.Stsfld, am_cache.Spec);
+                               ec.MarkLabel (l_initialized);
+                               ec.Emit (OpCodes.Ldsfld, am_cache.Spec);
                        }
                }
 
@@ -1597,11 +1645,6 @@ namespace Mono.CSharp {
                        return TypeManager.CSharpName (type);
                }
 
-               public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
-               {
-                       type = storey.MutateType (type);
-               }
-
                public static void Reset ()
                {
                        unique_id = 0;
@@ -1613,48 +1656,52 @@ namespace Mono.CSharp {
        //
        public class AnonymousTypeClass : CompilerGeneratedClass
        {
-               sealed class AnonymousParameters : ParametersCompiled
+               // TODO: Merge with AnonymousTypeParameter
+               public class GeneratedParameter : Parameter
                {
-                       public AnonymousParameters (params Parameter[] parameters)
-                               : base (parameters)
+                       public GeneratedParameter (FullNamedExpression type, AnonymousTypeParameter p)
+                               : base (type, p.Name, Modifier.NONE, null, p.Location)
                        {
                        }
-
-                       protected override void ErrorDuplicateName (Parameter p)
-                       {
-                               Report.Error (833, p.Location, "`{0}': An anonymous type cannot have multiple properties with the same name",
-                                       p.Name);
-                       }
                }
 
                static int types_counter;
                public const string ClassNamePrefix = "<>__AnonType";
                public const string SignatureForError = "anonymous type";
                
-               readonly ArrayList parameters;
+               readonly IList<AnonymousTypeParameter> parameters;
 
-               private AnonymousTypeClass (DeclSpace parent, MemberName name, ArrayList parameters, Location loc)
+               private AnonymousTypeClass (DeclSpace parent, MemberName name, IList<AnonymousTypeParameter> parameters, Location loc)
                        : base (parent, name, (RootContext.EvalMode ? Modifiers.PUBLIC : 0) | Modifiers.SEALED)
                {
                        this.parameters = parameters;
                }
 
-               public static AnonymousTypeClass Create (TypeContainer parent, ArrayList parameters, Location loc)
+               public static AnonymousTypeClass Create (CompilerContext ctx, TypeContainer parent, IList<AnonymousTypeParameter> parameters, Location loc)
                {
-                       if (RootContext.MetadataCompatibilityVersion < MetadataVersion.v2)
-                               Report.FeatureIsNotSupported (loc, "anonymous types");
-
                        string name = ClassNamePrefix + types_counter++;
 
-                       SimpleName [] t_args = new SimpleName [parameters.Count];
-                       TypeParameterName [] t_params = new TypeParameterName [parameters.Count];
-                       Parameter [] ctor_params = new Parameter [parameters.Count];
-                       for (int i = 0; i < parameters.Count; ++i) {
-                               AnonymousTypeParameter p = (AnonymousTypeParameter) parameters [i];
+                       ParametersCompiled all_parameters;
+                       TypeParameterName[] t_params;
+                       SimpleName[] t_args;
+
+                       if (parameters.Count == 0) {
+                               all_parameters = ParametersCompiled.EmptyReadOnlyParameters;
+                               t_params = new TypeParameterName[0];
+                               t_args = null;
+                       } else {
+                               t_args = new SimpleName[parameters.Count];
+                               t_params = new TypeParameterName[parameters.Count];
+                               Parameter[] ctor_params = new Parameter[parameters.Count];
+                               for (int i = 0; i < parameters.Count; ++i) {
+                                       AnonymousTypeParameter p = parameters[i];
+
+                                       t_args[i] = new SimpleName ("<" + p.Name + ">__T", p.Location);
+                                       t_params[i] = new TypeParameterName (t_args[i].Name, null, p.Location);
+                                       ctor_params[i] = new GeneratedParameter (t_args[i], p);
+                               }
 
-                               t_args [i] = new SimpleName ("<" + p.Name + ">__T", p.Location);
-                               t_params [i] = new TypeParameterName (t_args [i].Name, null, p.Location);
-                               ctor_params [i] = new Parameter (t_args [i], p.Name, 0, null, p.Location);
+                               all_parameters = new ParametersCompiled (ctor_params);
                        }
 
                        //
@@ -1668,15 +1715,15 @@ namespace Mono.CSharp {
                                a_type.SetParameterInfo (null);
 
                        Constructor c = new Constructor (a_type, name, Modifiers.PUBLIC | Modifiers.DEBUGGER_HIDDEN,
-                               null, new AnonymousParameters (ctor_params), null, loc);
-                       c.Block = new ToplevelBlock (c.Parameters, loc);
+                               null, all_parameters, null, loc);
+                       c.Block = new ToplevelBlock (ctx, c.ParameterInfo, loc);
 
                        // 
                        // Create fields and contructor body with field initialization
                        //
                        bool error = false;
                        for (int i = 0; i < parameters.Count; ++i) {
-                               AnonymousTypeParameter p = (AnonymousTypeParameter) parameters [i];
+                               AnonymousTypeParameter p = parameters [i];
 
                                Field f = new Field (a_type, t_args [i], Modifiers.PRIVATE | Modifiers.READONLY,
                                        new MemberName ("<" + p.Name + ">", p.Location), null);
@@ -1688,14 +1735,16 @@ namespace Mono.CSharp {
 
                                c.Block.AddStatement (new StatementExpression (
                                        new SimpleAssign (new MemberAccess (new This (p.Location), f.Name),
-                                               c.Block.GetParameterReference (p.Name, p.Location))));
+                                               c.Block.GetParameterReference (i, p.Location))));
 
-                               ToplevelBlock get_block = new ToplevelBlock (p.Location);
+                               ToplevelBlock get_block = new ToplevelBlock (ctx, p.Location);
                                get_block.AddStatement (new Return (
                                        new MemberAccess (new This (p.Location), f.Name), p.Location));
-                               Accessor get_accessor = new Accessor (get_block, 0, null, null, p.Location);
+
                                Property prop = new Property (a_type, t_args [i], Modifiers.PUBLIC,
-                                       new MemberName (p.Name, p.Location), null, get_accessor, null, false);
+                                       new MemberName (p.Name, p.Location), null);
+                               prop.Get = new Property.GetMethod (prop, 0, null, p.Location);
+                               prop.Get.Block = get_block;
                                a_type.AddProperty (prop);
                        }
 
@@ -1713,38 +1762,59 @@ namespace Mono.CSharp {
 
                protected override bool AddToContainer (MemberCore symbol, string name)
                {
-                       MemberCore mc = (MemberCore) defined_names [name];
+                       MemberCore mc = GetDefinition (name);
 
                        if (mc == null) {
                                defined_names.Add (name, symbol);
                                return true;
                        }
 
-                       Report.SymbolRelatedToPreviousError (mc);
-                       return false;
+                       // A conflict between anonymous type members will be reported
+                       if (symbol is TypeParameter) {
+                               Report.SymbolRelatedToPreviousError (symbol);
+                               return false;
+                       }
+
+                       // Ignore other conflicts
+                       return true;
                }
 
-               void DefineOverrides ()
+               protected override bool DoDefineMembers ()
                {
+                       if (!base.DoDefineMembers ())
+                               return false;
+
                        Location loc = Location;
 
-                       Method equals = new Method (this, null, TypeManager.system_boolean_expr,
+                       var equals_parameters = ParametersCompiled.CreateFullyResolved (
+                               new Parameter (new TypeExpression (TypeManager.object_type, loc), "obj", 0, null, loc), TypeManager.object_type);
+
+                       Method equals = new Method (this, null, new TypeExpression (TypeManager.bool_type, loc),
                                Modifiers.PUBLIC | Modifiers.OVERRIDE | Modifiers.DEBUGGER_HIDDEN, new MemberName ("Equals", loc),
-                               Mono.CSharp.ParametersCompiled.CreateFullyResolved (new Parameter (null, "obj", 0, null, loc), TypeManager.object_type), null);
+                               equals_parameters, null);
+
+                       equals_parameters[0].Resolve (equals, 0);
 
-                       Method tostring = new Method (this, null, TypeManager.system_string_expr,
+                       Method tostring = new Method (this, null, new TypeExpression (TypeManager.string_type, loc),
                                Modifiers.PUBLIC | Modifiers.OVERRIDE | Modifiers.DEBUGGER_HIDDEN, new MemberName ("ToString", loc),
                                Mono.CSharp.ParametersCompiled.EmptyReadOnlyParameters, null);
 
-                       ToplevelBlock equals_block = new ToplevelBlock (equals.Parameters, loc);
+                       ToplevelBlock equals_block = new ToplevelBlock (Compiler, equals.ParameterInfo, loc);
+
                        TypeExpr current_type;
-                       if (IsGeneric)
-                               current_type = new GenericTypeExpr (this, loc);
-                       else
-                               current_type = new TypeExpression (TypeBuilder, loc);
+                       if (type_params != null) {
+                               var targs = new TypeArguments ();
+                               foreach (var type_param in type_params)
+                                       targs.Add (new TypeParameterExpr (type_param, type_param.Location));
 
-                       equals_block.AddVariable (current_type, "other", loc);
-                       LocalVariableReference other_variable = new LocalVariableReference (equals_block, "other", loc);
+                               current_type = new GenericTypeExpr (Definition, targs, loc);
+                       } else {
+                               current_type = new TypeExpression (Definition, loc);
+                       }
+
+                       var li_other = LocalVariable.CreateCompilerGenerated (CurrentType, equals_block, loc);
+                       equals_block.AddStatement (new BlockVariableDeclaration (new TypeExpression (li_other.Type, loc), li_other));
+                       var other_variable = new LocalVariableReference (li_other, loc);
 
                        MemberAccess system_collections_generic = new MemberAccess (new MemberAccess (
                                new QualifiedAliasMember ("global", "System", loc), "Collections", loc), "Generic", loc);
@@ -1753,12 +1823,12 @@ namespace Mono.CSharp {
                        Expression string_concat = new StringConstant ("{", loc);
                        Expression rs_hashcode = new IntConstant (-2128831035, loc);
                        for (int i = 0; i < parameters.Count; ++i) {
-                               AnonymousTypeParameter p = (AnonymousTypeParameter) parameters [i];
-                               Field f = (Field) Fields [i];
+                               var p = parameters [i];
+                               var f = Fields [i];
 
                                MemberAccess equality_comparer = new MemberAccess (new MemberAccess (
                                        system_collections_generic, "EqualityComparer",
-                                               new TypeArguments (new SimpleName (TypeParameters [i].Name, loc)), loc),
+                                               new TypeArguments (new SimpleName (CurrentTypeParameters [i].Name, loc)), loc),
                                                "Default", loc);
 
                                Arguments arguments_equal = new Arguments (2);
@@ -1775,14 +1845,14 @@ namespace Mono.CSharp {
 
                                IntConstant FNV_prime = new IntConstant (16777619, loc);                                
                                rs_hashcode = new Binary (Binary.Operator.Multiply,
-                                       new Binary (Binary.Operator.ExclusiveOr, rs_hashcode, field_hashcode),
-                                       FNV_prime);
+                                       new Binary (Binary.Operator.ExclusiveOr, rs_hashcode, field_hashcode, loc),
+                                       FNV_prime, loc);
 
-                               Expression field_to_string = new Conditional (new Binary (Binary.Operator.Inequality,
-                                       new MemberAccess (new This (f.Location), f.Name), new NullLiteral (loc)),
+                               Expression field_to_string = new Conditional (new BooleanExpression (new Binary (Binary.Operator.Inequality,
+                                       new MemberAccess (new This (f.Location), f.Name), new NullLiteral (loc), loc)),
                                        new Invocation (new MemberAccess (
                                                new MemberAccess (new This (f.Location), f.Name), "ToString"), null),
-                                       new StringConstant (string.Empty, loc));
+                                       new StringConstant (string.Empty, loc), loc);
 
                                if (rs_equals == null) {
                                        rs_equals = field_equal;
@@ -1790,7 +1860,9 @@ namespace Mono.CSharp {
                                                string_concat,
                                                new Binary (Binary.Operator.Addition,
                                                        new StringConstant (" " + p.Name + " = ", loc),
-                                                       field_to_string));
+                                                       field_to_string,
+                                                       loc),
+                                               loc);
                                        continue;
                                }
 
@@ -1800,28 +1872,31 @@ namespace Mono.CSharp {
                                string_concat = new Binary (Binary.Operator.Addition,
                                        new Binary (Binary.Operator.Addition,
                                                string_concat,
-                                               new StringConstant (", " + p.Name + " = ", loc)),
-                                       field_to_string);
+                                               new StringConstant (", " + p.Name + " = ", loc),
+                                               loc),
+                                       field_to_string,
+                                       loc);
 
-                               rs_equals = new Binary (Binary.Operator.LogicalAnd, rs_equals, field_equal);
+                               rs_equals = new Binary (Binary.Operator.LogicalAnd, rs_equals, field_equal, loc);
                        }
 
                        string_concat = new Binary (Binary.Operator.Addition,
                                string_concat,
-                               new StringConstant (" }", loc));
+                               new StringConstant (" }", loc),
+                               loc);
 
                        //
                        // Equals (object obj) override
                        //              
-                       LocalVariableReference other_variable_assign = new LocalVariableReference (equals_block, "other", loc);
+                       var other_variable_assign = new TemporaryVariableReference (li_other, loc);
                        equals_block.AddStatement (new StatementExpression (
                                new SimpleAssign (other_variable_assign,
-                                       new As (equals_block.GetParameterReference ("obj", loc),
+                                       new As (equals_block.GetParameterReference (0, loc),
                                                current_type, loc), loc)));
 
-                       Expression equals_test = new Binary (Binary.Operator.Inequality, other_variable, new NullLiteral (loc));
+                       Expression equals_test = new Binary (Binary.Operator.Inequality, other_variable, new NullLiteral (loc), loc);
                        if (rs_equals != null)
-                               equals_test = new Binary (Binary.Operator.LogicalAnd, equals_test, rs_equals);
+                               equals_test = new Binary (Binary.Operator.LogicalAnd, equals_test, rs_equals, loc);
                        equals_block.AddStatement (new Return (equals_test, loc));
 
                        equals.Block = equals_block;
@@ -1831,7 +1906,7 @@ namespace Mono.CSharp {
                        //
                        // GetHashCode () override
                        //
-                       Method hashcode = new Method (this, null, TypeManager.system_int32_expr,
+                       Method hashcode = new Method (this, null, new TypeExpression (TypeManager.int32_type, loc),
                                Modifiers.PUBLIC | Modifiers.OVERRIDE | Modifiers.DEBUGGER_HIDDEN,
                                new MemberName ("GetHashCode", loc),
                                Mono.CSharp.ParametersCompiled.EmptyReadOnlyParameters, null);
@@ -1850,31 +1925,32 @@ namespace Mono.CSharp {
                        // hash ^= hash >> 17;
                        // hash += hash << 5;
 
-                       ToplevelBlock hashcode_top = new ToplevelBlock (loc);
-                       Block hashcode_block = new Block (hashcode_top);
-                       hashcode_top.AddStatement (new Unchecked (hashcode_block));
+                       ToplevelBlock hashcode_top = new ToplevelBlock (Compiler, loc);
+                       Block hashcode_block = new Block (hashcode_top, loc, loc);
+                       hashcode_top.AddStatement (new Unchecked (hashcode_block, loc));
 
-                       hashcode_block.AddVariable (TypeManager.system_int32_expr, "hash", loc);
-                       LocalVariableReference hash_variable = new LocalVariableReference (hashcode_block, "hash", loc);
-                       LocalVariableReference hash_variable_assign = new LocalVariableReference (hashcode_block, "hash", loc);
+                       var li_hash = LocalVariable.CreateCompilerGenerated (TypeManager.int32_type, hashcode_top, loc);
+                       hashcode_block.AddStatement (new BlockVariableDeclaration (new TypeExpression (li_hash.Type, loc), li_hash));
+                       LocalVariableReference hash_variable_assign = new LocalVariableReference (li_hash, loc);
                        hashcode_block.AddStatement (new StatementExpression (
                                new SimpleAssign (hash_variable_assign, rs_hashcode)));
 
+                       var hash_variable = new LocalVariableReference (li_hash, loc);
                        hashcode_block.AddStatement (new StatementExpression (
                                new CompoundAssign (Binary.Operator.Addition, hash_variable,
-                                       new Binary (Binary.Operator.LeftShift, hash_variable, new IntConstant (13, loc)))));
+                                       new Binary (Binary.Operator.LeftShift, hash_variable, new IntConstant (13, loc), loc), loc)));
                        hashcode_block.AddStatement (new StatementExpression (
                                new CompoundAssign (Binary.Operator.ExclusiveOr, hash_variable,
-                                       new Binary (Binary.Operator.RightShift, hash_variable, new IntConstant (7, loc)))));
+                                       new Binary (Binary.Operator.RightShift, hash_variable, new IntConstant (7, loc), loc), loc)));
                        hashcode_block.AddStatement (new StatementExpression (
                                new CompoundAssign (Binary.Operator.Addition, hash_variable,
-                                       new Binary (Binary.Operator.LeftShift, hash_variable, new IntConstant (3, loc)))));
+                                       new Binary (Binary.Operator.LeftShift, hash_variable, new IntConstant (3, loc), loc), loc)));
                        hashcode_block.AddStatement (new StatementExpression (
                                new CompoundAssign (Binary.Operator.ExclusiveOr, hash_variable,
-                                       new Binary (Binary.Operator.RightShift, hash_variable, new IntConstant (17, loc)))));
+                                       new Binary (Binary.Operator.RightShift, hash_variable, new IntConstant (17, loc), loc), loc)));
                        hashcode_block.AddStatement (new StatementExpression (
                                new CompoundAssign (Binary.Operator.Addition, hash_variable,
-                                       new Binary (Binary.Operator.LeftShift, hash_variable, new IntConstant (5, loc)))));
+                                       new Binary (Binary.Operator.LeftShift, hash_variable, new IntConstant (5, loc), loc), loc)));
 
                        hashcode_block.AddStatement (new Return (hash_variable, loc));
                        hashcode.Block = hashcode_top;
@@ -1885,19 +1961,12 @@ namespace Mono.CSharp {
                        // ToString () override
                        //
 
-                       ToplevelBlock tostring_block = new ToplevelBlock (loc);
+                       ToplevelBlock tostring_block = new ToplevelBlock (Compiler, loc);
                        tostring_block.AddStatement (new Return (string_concat, loc));
                        tostring.Block = tostring_block;
                        tostring.Define ();
                        AddMethod (tostring);
-               }
-
-               public override bool Define ()
-               {
-                       if (!base.Define ())
-                               return false;
 
-                       DefineOverrides ();
                        return true;
                }
 
@@ -1906,7 +1975,7 @@ namespace Mono.CSharp {
                        return SignatureForError;
                }
 
-               public ArrayList Parameters {
+               public IList<AnonymousTypeParameter> Parameters {
                        get {
                                return parameters;
                        }