Implement Date.

dart/frog/leg/frog_leg.dart

Index: dart/frog/leg/frog_leg.dart
diff --git a/dart/frog/leg/frog_leg.dart b/dart/frog/leg/frog_leg.dart
index 646e95bee362f4ec64b53b7ac466014270fbdaa7..b1228b68ec4a561cb597f6f529a15e3a0954679d 100644
--- a/dart/frog/leg/frog_leg.dart
+++ b/dart/frog/leg/frog_leg.dart
@@ -117,8 +117,13 @@ class WorldCompiler extends Compiler {
         element = element.enclosingElement;
         // TODO(ahe): I plan to overhaul this infrastructure anyways.
       }
-      withCurrentElement(element,
-          () => cancel(reason: reason, token: element.position()));
+      if (element !== null) {
+        withCurrentElement(element,
+            () => cancel(reason: reason, token: element.position()));
+      }
+    } else if (currentElement !== null) {
+      cancel(reason, element: currentElement);
+      return;

[kasperl, 2012/02/21 07:23:30]

We usually do not return after a cancel.

     }
     if (throwOnError) {
       throw new AbortLeg(reason);