Register type for literal list/map.

sdk/lib/_internal/compiler/implementation/compiler.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;
 
 /**
  * If true, print a warning for each method that was resolved, but not
  * compiled.
  */
@@ skipping 1233 matching lines @@
  * be either a [:bool:] or a no-arg function returning a [:bool:].
  *
  * Use this method to provide better information for assertion by calling
  * [invariant] as the argument to an [:assert:] statement:
  *
  *     assert(invariant(position, isValid));
  *
  * [spannable] must be non-null and will be used to provide positional
  * information in the generated error message.
  */
-bool invariant(Spannable spannable, var condition, {String message: null}) {
+bool invariant(Spannable spannable, var condition, {var message: null}) {
   // TODO(johnniwinther): Use [spannable] and [message] to provide better
   // information on assertion errors.
   if (condition is Function){
     condition = condition();
   }
   if (spannable == null || !condition) {
+    if (message is Function) {
+      message = message();
+    }
     throw new SpannableAssertionFailure(spannable, message);
   }
   return true;
 }
 
 /// A sink that drains into /dev/null.
 class NullSink implements EventSink<String> {
   final String name;
 
   NullSink(this.name);
 
   add(String value) {}
 
   void addError(AsyncError error) {}
 
   void close() {}
 
   toString() => name;
 
   /// Convenience method for getting an [api.CompilerOutputProvider].
   static NullSink outputProvider(String name, String extension) {
     return new NullSink('$name.$extension');
   }
 }