Update all tests

tests/language/assign_to_type_test.dart

 // Copyright (c) 2015, 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.
 
 // Verify that an attempt to assign to a class, enum, typedef, or type
 // parameter produces a static warning and runtime error.
 
 import "package:expect/expect.dart";
 
 noMethod(e) => e is NoSuchMethodError;
 
 class C<T> {
   f() {
-    Expect.throws(() => T = null, noMethod); /// 01: static type warning
+    Expect.throws(() => T = null, noMethod); //# 01: static type warning
   }
 }
 
 class D {}
 
 enum E { e0 }
 
 typedef void F();
 
 main() {
   new C<D>().f();
-  Expect.throws(() => D = null, noMethod); /// 02: static type warning
-  Expect.throws(() => E = null, noMethod); /// 03: static type warning
-  Expect.throws(() => F = null, noMethod); /// 04: static type warning
+  Expect.throws(() => D = null, noMethod); //# 02: static type warning
+  Expect.throws(() => E = null, noMethod); //# 03: static type warning
+  Expect.throws(() => F = null, noMethod); //# 04: static type warning
 }