Ambiguous type references require a compile time error in some special cases

tests/language/type_variable_bounds_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Test of parameterized factory methods.
 
 class Foo<T extends num> {
   Foo();
 
   factory XFoo.bad() { return null; } /// 00: static type warning
@@ skipping 42 matching lines @@
   new Biz();
 
   fi = new Foo();
   fs = new Foo();
 
   new Box().makeFoo();
   new Box<int>().makeFoo();
   new Box<String>().makeFoo();
 
   // Fisk does not exist.
-  new Box<Fisk>(); /// 07: compile-time error
+  new Box<Fisk>(); /// 07: static type warning, dynamic type error
 
   // Too many type arguments.
   new Box<Object, Object>(); /// 08: compile-time error
 
   // Fisk does not exist.
   Box<Fisk> box = null; /// 09: static type warning
 
   // Too many type arguments.
   Box<Object, Object> box = null; /// 10: static type warning
 }