Fix issue 7677: recognize const declarations inside methods.

sdk/lib/_internal/compiler/implementation/compile_time_constants.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.
 
 part of dart2js;
 
 /**
  * The [ConstantHandler] keeps track of compile-time constants,
  * initializations of global and static fields, and default values of
  * optional parameters.
@@ skipping 444 matching lines @@
       } else if (Elements.isStaticOrTopLevelField(element)) {
         Constant result;
         if (element.modifiers.isConst()) {
           result = handler.compileConstant(element);
         } else if (element.modifiers.isFinal() && !isEvaluatingConstant) {
           result = handler.compileVariable(element);
         }
         if (result != null) return result;
       } else if (Elements.isClass(element) || Elements.isTypedef(element)) {
         return makeTypeConstant(element);
+      } else if (send.receiver != null) {
+        // Fall through to error handling.
+      } else if (!Elements.isUnresolved(element)
+                 && element.isVariable()
+                 && element.modifiers.isConst()) {
+        Constant result = handler.compileConstant(element);
+        if (result != null) return result; 
       }
       return signalNotCompileTimeConstant(send);
     } else if (send.isCall) {
       if (identical(element, compiler.identicalFunction)
           && send.argumentCount() == 2) {
         Constant left = evaluate(send.argumentsNode.nodes.head);
         Constant right = evaluate(send.argumentsNode.nodes.tail.head);
         Constant result = constantSystem.identity.fold(left, right);
         if (result != null) return result;
       } else if (Elements.isClass(element) || Elements.isTypedef(element)) {
@@ skipping 395 matching lines @@
             // Use the default value.
             fieldValue = handler.compileConstant(field);
           }
           jsNewArguments.add(fieldValue);
         },
         includeBackendMembers: true,
         includeSuperMembers: true);
     return jsNewArguments;
   }
 }