Change compile time error into a warning and update multitest.

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 4001 matching lines @@
                                              Node expression) {
     // Find the unnamed constructor if the reference resolved to a
     // class.
     if (!Elements.isUnresolved(e) && !e.isConstructor()) {
       if (e.isClass()) {
         ClassElement cls = e;
         cls.ensureResolved(compiler);
         // The unnamed constructor may not exist, so [e] may become unresolved.
         e = lookupConstructor(cls, diagnosticNode, const SourceString(''));
       } else {
-        error(diagnosticNode,
-              MessageKind.NOT_A_TYPE.error,
+        e = failOrReturnErroneousElement(
+              e, diagnosticNode, e.name, MessageKind.NOT_A_TYPE,
               {'node': diagnosticNode});
       }
     }
     if (type == null) {
       if (Elements.isUnresolved(e)) {
         type = compiler.types.dynamicType;
       } else {
         type = e.getEnclosingClass().computeType(compiler).asRaw();
       }
     }
@@ skipping 59 matching lines @@
     return e;
   }
 
   /// Assumed to be called by [resolveRedirectingFactory].
   Element visitReturn(Return node) {
     Node expression = node.expression;
     return finishConstructorReference(visit(expression),
                                       expression, expression);
   }
 }