Add check for duplicate field initialization

runtime/vm/parser.h

 // Copyright (c) 2012, 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.
 
 #ifndef VM_PARSER_H_
 #define VM_PARSER_H_
 
 #include "include/dart_api.h"
 
 #include "vm/ast.h"
@@ skipping 290 matching lines @@
   void ParseClassMemberDefinition(ClassDesc* members);
   void ParseFormalParameter(bool allow_explicit_default_value,
                             ParamList* params);
   void ParseFormalParameters(bool allow_explicit_default_values,
                              ParamList* params);
   void ParseFormalParameterList(bool allow_explicit_default_values,
                                 ParamList* params);
   void CheckConstFieldsInitialized(const Class& cls);
   void CheckConstructors(ClassDesc* members);
   void ParseInitializedInstanceFields(const Class& cls,
-           GrowableArray<FieldInitExpression>* initializers);
+           GrowableArray<FieldInitExpression>* initializers,
+           GrowableArray<Field*>* initialized_fields);
+  void CheckDuplicateFieldInit(intptr_t init_pos,
+                               GrowableArray<Field*>* initialized_fields,
+                               Field* field);
   void GenerateSuperConstructorCall(const Class& cls,
                                     LocalVariable* receiver);
   AstNode* ParseSuperInitializer(const Class& cls, LocalVariable* receiver);
-  AstNode* ParseInitializer(const Class& cls, LocalVariable* receiver);
+  AstNode* ParseInitializer(const Class& cls,
+                            LocalVariable* receiver,
+                            GrowableArray<Field*>* initialized_fields);
   void ParseConstructorRedirection(const Class& cls, LocalVariable* receiver);
-  void ParseInitializers(const Class& cls, LocalVariable* receiver);
+  void ParseInitializers(const Class& cls,
+                         LocalVariable* receiver,
+                         GrowableArray<Field*>* initialized_fields);
   String& ParseNativeDeclaration();
   // TODO(srdjan): Return TypeArguments instead of Array?
   RawArray* ParseInterfaceList();
   void AddInterfaces(intptr_t interfaces_pos,
                      const Class& cls,
                      const Array& interfaces);
   ArgumentListNode* BuildNoSuchMethodArguments(
       const String& function_name, const ArgumentListNode& function_args);
   RawFunction* GetSuperFunction(intptr_t token_pos,
                                 const String& name,
@@ skipping 227 matching lines @@
 
   // Allocate temporary only once per function.
   LocalVariable* expression_temp_;
 
   DISALLOW_COPY_AND_ASSIGN(Parser);
 };
 
 }  // namespace dart
 
 #endif  // VM_PARSER_H_