- Parse the return type of JS during resolution to know what can be instantiated there.

sdk/lib/_internal/compiler/implementation/lib/js_helper.dart

Index: sdk/lib/_internal/compiler/implementation/lib/js_helper.dart
===================================================================
--- sdk/lib/_internal/compiler/implementation/lib/js_helper.dart	(revision 15508)
+++ sdk/lib/_internal/compiler/implementation/lib/js_helper.dart	(working copy)
@@ -463,7 +463,7 @@
 
   static int parseInt(String string) {
     checkString(string);
-    var match = JS('=List',
+    var match = JS('=List|Null',

[ahe, 2012/11/29 14:48:43]

What does this mean?  Where is it documented what it means?

[ngeoffray, 2012/11/30 11:30:00]

The documentation is currently in NativeBehavior::ofJsCall (in
native_handler.dart). Moving JS (and its documentation) to its own library is
something I intend to address soon.

                    r'/^\s*[+-]?(?:0(x)[a-f0-9]+|\d+)\s*$/i.exec(#)',
                    string);
     if (match == null) {