Disallow const getters.

pkg/compiler/lib/src/parser/parser.dart

 // 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.
 
 library dart2js.parser;
 
 import '../common.dart';
 import '../tokens/keyword.dart' show
     Keyword;
 import '../tokens/precedence.dart' show
@@ skipping 913 matching lines @@
     return token;
   }
 
   Token parseTopLevelMethod(Token start,
                             Link<Token> modifiers,
                             Token type,
                             Token getOrSet,
                             Token name) {
 
     Token externalModifier;
+    // TODO(johnniwinther): Move error reporting to resolution to give more
+    // specific error messages.
     for (Token modifier in modifiers) {
       if (externalModifier == null && optional('external', modifier)) {
         externalModifier = modifier;
       } else {
         listener.reportError(
             modifier, MessageKind.EXTRANEOUS_MODIFIER, {'modifier': modifier});
       }
     }
     if (externalModifier != null) {
       parseModifier(externalModifier);
@@ skipping 355 matching lines @@
   Token parseMethod(Token start,
                     Link<Token> modifiers,
                     Token type,
                     Token getOrSet,
                     Token name) {
     Token externalModifier;
     Token staticModifier;
     Token constModifier;
     int modifierCount = 0;
     int allowedModifierCount = 1;
+    // TODO(johnniwinther): Move error reporting to resolution to give more
+    // specific error messages.
     for (Token modifier in modifiers) {
       if (externalModifier == null && optional('external', modifier)) {
         modifierCount++;
         externalModifier = modifier;
         if (modifierCount != allowedModifierCount) {
           listener.reportError(
               modifier,
               MessageKind.EXTRANEOUS_MODIFIER, {'modifier': modifier});
         }
         allowedModifierCount++;
@@ skipping 11 matching lines @@
         if (modifierCount != allowedModifierCount) {
           listener.reportError(
               modifier,
               MessageKind.EXTRANEOUS_MODIFIER, {'modifier': modifier});
         }
       } else {
         listener.reportError(
             modifier, MessageKind.EXTRANEOUS_MODIFIER, {'modifier': modifier});
       }
     }
+    if (getOrSet != null &&  constModifier != null) {
+      listener.reportError(
+          constModifier, MessageKind.EXTRANEOUS_MODIFIER,
+          {'modifier': constModifier});
+    }
     parseModifierList(modifiers);
 
     if (type == null) {
       listener.handleNoType(name);
     } else {
       parseReturnTypeOpt(type);
     }
     Token token;
     if (optional('operator', name)) {
       token = parseOperatorName(name);
       if (staticModifier != null) {
-        // TODO(ahe): Consider a more specific error message.
         listener.reportError(
             staticModifier, MessageKind.EXTRANEOUS_MODIFIER,
             {'modifier': staticModifier});
       }
     } else {
       token = parseIdentifier(name);
     }
 
     token = parseQualifiedRestOpt(token);
     token = parseFormalParametersOpt(token);
@@ skipping 1362 matching lines @@
     }
     listener.handleContinueStatement(hasTarget, continueKeyword, token);
     return expectSemicolon(token);
   }
 
   Token parseEmptyStatement(Token token) {
     listener.handleEmptyStatement(token);
     return expectSemicolon(token);
   }
 }