Report compile-time errors for conflicting overrides as specified by latest

runtime/vm/parser.cc

 // 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.
 
 #include "vm/parser.h"
 
 #include "lib/invocation_mirror.h"
 #include "vm/bigint_operations.h"
 #include "vm/bootstrap.h"
 #include "vm/class_finalizer.h"
@@ skipping 3104 matching lines @@
     ErrorMsg("keyword 'abstract' not allowed in field declaration");
   }
   if (field->has_external) {
     ErrorMsg("keyword 'external' not allowed in field declaration");
   }
   if (field->has_factory) {
     ErrorMsg("keyword 'factory' not allowed in field declaration");
   }
   if (members->FieldNameExists(*field->name, !field->has_final)) {
     ErrorMsg(field->name_pos,
-             "'%s' field/method already defined\n", field->name->ToCString());
+             "field or method '%s' already defined", field->name->ToCString());
   }
   Function& getter = Function::Handle();
   Function& setter = Function::Handle();
   Field& class_field = Field::Handle();
   Instance& init_value = Instance::Handle();
   while (true) {
     bool has_initializer = CurrentToken() == Token::kASSIGN;
     bool has_simple_literal = false;
     if (has_initializer) {
       ConsumeToken();
@@ skipping 7191 matching lines @@
 void Parser::SkipQualIdent() {
   ASSERT(IsIdentifier());
   ConsumeToken();
   if (CurrentToken() == Token::kPERIOD) {
     ConsumeToken();  // Consume the kPERIOD token.
     ExpectIdentifier("identifier expected after '.'");
   }
 }
 
 }  // namespace dart