Make test of malformed types a dynamic type error.

sdk/lib/_internal/lib/js_helper.dart

Index: sdk/lib/_internal/lib/js_helper.dart
diff --git a/sdk/lib/_internal/lib/js_helper.dart b/sdk/lib/_internal/lib/js_helper.dart
index 98f9798a2cc211129e8d32e427dd9d627e2d449a..291a052ce2a54ddcfc928898d772974b7891d0a4 100644
--- a/sdk/lib/_internal/lib/js_helper.dart
+++ b/sdk/lib/_internal/lib/js_helper.dart
@@ -1939,6 +1939,11 @@ voidTypeCheck(value) {
   throw new TypeErrorImplementation(value, 'void');
 }
 
+malformedTypeCheck(value, message) {

[karlklose, 2013/11/05 09:48:14]

This method does not actually do a type check (same with the method above). Can
you think of a better name?

[Johnni Winther, 2013/11/05 10:58:41]

Changed to 'checkMalformedType'.

+  if (value == null) return value;
+  throw new TypeErrorImplementation.fromMessage(message);
+}
+
 /**
  * Special interface recognized by the compiler and implemented by DOM
  * objects that support integer indexing. This interface is not