Handle implicit closure of toString.

dart/frog/leg/lib/js_helper.dart

Index: dart/frog/leg/lib/js_helper.dart
diff --git a/dart/frog/leg/lib/js_helper.dart b/dart/frog/leg/lib/js_helper.dart
index ca78471a909b3163ed3598c2f1b89b0d453dd6d8..b03ecf42f27a2cde14eb3e24070a02f09a680e02 100644
--- a/dart/frog/leg/lib/js_helper.dart
+++ b/dart/frog/leg/lib/js_helper.dart
@@ -1360,6 +1360,9 @@ interface Dynamic {
  */
 class Null {
   factory Null() {
-    throw UnsupportedOperationException('new Null()');
+    throw new UnsupportedOperationException('new Null()');
   }
 }
+
+// TODO(ahe): We should automatically generate these.

[ngeoffray, 2012/03/26 08:47:32]

Just talked with Lasse about this. It's not so trivial to automatically generate
those. Right now, we have a very simple scheme to recognize if something must be
intercepted. Doing something more elegant requires either:

a) Build a table before starting compiling that contains all methods that must
be intercepted (eg methods on List,String,num interfaces), or

b) Have a tool that generates the dart file containing the getters.

Since we already write the interceptors, as well as the ones that have default
values, it doesn't seem that bad to manually write a getter just after the
interceptor. It will make things very easy, including optional arguments:

builtin$get$indexOf(receiver) {
 return (value, [int startIndex]) => builtin$indexOf(receiver, value,
startIndex);
}

[ahe, 2012/03/26 09:24:57]

I have removed the TODO for now and continued the discussion in a new thread.

+builtin$get$toString(receiver) => () => builtin$toString$0(receiver);