Check for uninitialized constant variables.

sdk/lib/_internal/compiler/implementation/resolution/members.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 resolution;
 
 abstract class TreeElements {
   Element get currentElement;
   Set<Node> get superUses;
 
@@ skipping 3894 matching lines @@
     assert(node.arguments.tail.isEmpty); // Sanity check
     Identifier identifier = node.selector;
     SourceString name = identifier.source;
     VariableDefinitionScope scope =
         new VariableDefinitionScope(resolver.scope, name);
     resolver.visitIn(node.arguments.head, scope);
     if (scope.variableReferencedInInitializer) {
       resolver.error(identifier, MessageKind.REFERENCE_IN_INITIALIZATION,
                      {'variableName': name.toString()});
     }
-    return visit(node.selector);
+    return name;
   }
 
   SourceString visitIdentifier(Identifier node) {
     // The variable is initialized to null.
     resolver.world.registerInstantiatedClass(compiler.nullClass,
                                              resolver.mapping);
+    if (definitions.modifiers.isConst()) {
+      compiler.reportError(node, MessageKind.CONST_WITHOUT_INITIALIZER);
+    }
     return node.source;
   }
 
   visitNodeList(NodeList node) {
     for (Link<Node> link = node.nodes; !link.isEmpty; link = link.tail) {
       SourceString name = visit(link.head);
       VariableElement element =
           new VariableElementX(name, variables, kind, link.head);
       resolver.defineElement(link.head, element);
     }
@@ skipping 387 matching lines @@
     return e;
   }
 
   /// Assumed to be called by [resolveRedirectingFactory].
   Element visitReturn(Return node) {
     Node expression = node.expression;
     return finishConstructorReference(visit(expression),
                                       expression, expression);
   }
 }