Checked mode throws a TypeError.

tests/language/inferrer_synthesized_constructor_test.dart

Index: tests/language/inferrer_synthesized_constructor_test.dart
===================================================================
--- tests/language/inferrer_synthesized_constructor_test.dart	(revision 27010)
+++ tests/language/inferrer_synthesized_constructor_test.dart	(working copy)
@@ -22,5 +22,6 @@
   // used to only see this call and consider the [A.x] field to always
   // be int.
   Expect.equals(84, new A(42).x + 42);
-  Expect.throws(() => new B().x + 42, (e) => e is ArgumentError);
+  Expect.throws(() => new B().x + 42,
+                (e) => e is ArgumentError || e is TypeError);
 }