Support type literals as compile-time constants.

sdk/lib/_internal/compiler/implementation/elements/elements.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 elements;
 
 import 'dart:uri';
 
 // TODO(ahe): Rename prefix to 'api' when VM bug is fixed.
 import '../../compiler.dart' as api_e;
@@ skipping 1709 matching lines @@
     } else {
       return super.toString();
     }
   }
 }
 
 class Elements {
   static bool isUnresolved(Element e) => e == null || e.isErroneous();
   static bool isErroneousElement(Element e) => e != null && e.isErroneous();
 
+  static bool isClass(Element e) => e != null && e.kind == ElementKind.CLASS;
+  static bool isTypedef(Element e) {
+    return e != null && e.kind == ElementKind.TYPEDEF;
+  }
+
   static bool isLocal(Element element) {
     return !Elements.isUnresolved(element)
             && !element.isInstanceMember()
             && !isStaticOrTopLevelField(element)
             && !isStaticOrTopLevelFunction(element)
             && (identical(element.kind, ElementKind.VARIABLE) ||
                 identical(element.kind, ElementKind.PARAMETER) ||
                 identical(element.kind, ElementKind.FUNCTION));
   }
 
@@ skipping 299 matching lines @@
 
   MetadataAnnotation ensureResolved(Compiler compiler) {
     if (resolutionState == STATE_NOT_STARTED) {
       compiler.resolver.resolveMetadataAnnotation(this);
     }
     return this;
   }
 
   String toString() => 'MetadataAnnotation($value, $resolutionState)';
 }