Merge the 3 different closure nodes into a single node.

runtime/vm/parser.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/parser.h"
 
 #include "vm/bigint_operations.h"
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
 #include "vm/compiler_stats.h"
@@ skipping 1104 matching lines @@
   }
   return super_op;
 }
 
 
 AstNode* Parser::CreateImplicitClosureNode(const Function& func,
                                            intptr_t token_pos,
                                            AstNode* receiver) {
   Function& implicit_closure_function =
       Function::ZoneHandle(func.ImplicitClosureFunction());
-  if (receiver == NULL) {
-    return new ImplicitStaticClosureNode(token_pos, implicit_closure_function);
-  } else {
+  if (receiver != NULL) {
     // If we create an implicit instance closure from inside a closure of a
     // parameterized class, make sure that the receiver is captured as
     // instantiator.
     if (current_block_->scope->function_level() > 0) {
       const Class& signature_class = Class::Handle(func.signature_class());
       if (signature_class.IsParameterized()) {
         CaptureReceiver();
       }
     }
-    return new ImplicitInstanceClosureNode(token_pos,
-                                          implicit_closure_function,
-                                          receiver);
   }
+  return new ClosureNode(token_pos, implicit_closure_function, receiver, NULL);
 }
 
 
 AstNode* Parser::ParseSuperFieldAccess(const String& field_name) {
   const intptr_t field_pos = token_index_;
   const Class& super_class = Class::Handle(current_class().SuperClass());
   if (super_class.IsNull()) {
     ErrorMsg("class '%s' does not have a superclass",
              String::Handle(current_class().Name()).ToCString());
   }
@@ skipping 2340 matching lines @@
   // captured. The captured variables will be recorded along with their
   // allocation information in a Scope object stored in the function object.
   // This Scope object is then provided to the compiler when compiling the local
   // function. It would be too early to record the captured variables here,
   // since further closure functions may capture more variables.
   // This Scope object is constructed after all variables have been allocated.
   // The local scope of the parsed function can be pruned, since contained
   // variables are not relevant for the compilation of the enclosing function.
   // This pruning is done by omitting to hook the local scope in its parent
   // scope in the constructor of LocalScope.
-  AstNode* closure = new ClosureNode(ident_pos, function, statements->scope());
+  AstNode* closure =
+      new ClosureNode(ident_pos, function, NULL, statements->scope());
 
   if (function_variable == NULL) {
     ASSERT(is_literal);
     return closure;
   } else {
     AstNode* initialization =
         new StoreLocalNode(ident_pos, *function_variable, closure);
     return initialization;
   }
 }
@@ skipping 3525 matching lines @@
 }
 
 
 void Parser::SkipNestedExpr() {
   const bool saved_mode = SetAllowFunctionLiterals(true);
   SkipExpr();
   SetAllowFunctionLiterals(saved_mode);
 }
 
 }  // namespace dart