Support bounded mixins in the VM (fix issue 14453).

tests/language/mixin_invalid_bound_test.dart

Index: tests/language/mixin_invalid_bound_test.dart
===================================================================
--- tests/language/mixin_invalid_bound_test.dart	(revision 0)
+++ tests/language/mixin_invalid_bound_test.dart	(revision 0)
@@ -0,0 +1,32 @@
+// Copyright (c) 2014, 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.
+
+class S0<T> { }
+
+class S<T extends num> extends S0<String> { }
+
+class M<T extends num> { }
+
+class A<T extends num> extends S with M { }
+
+class B<T> extends S<T> with M<int> { }

[gbracha, 2014/01/14 01:39:33]

static type error in S<T> since T is not a subtype of num. Same in D. Analogous
situation with M<T> in C and E. Obviously M<bool> and S<bool> below as well.

[regis, 2014/01/14 18:40:45]

Done.

+
+class C<T> extends S<int> with M<T> { }
+
+class D<T> extends S<T> with M<bool> { }
+
+class E<T> extends S<bool> with M<T> { }
+
+main() {
+  new A<int>();  /// 01: ok
+  new A<bool>();  /// 02: static type warning, dynamic type error
+  new B<int>();  /// 03: ok
+  new B<bool>();  /// 04: static type warning, dynamic type error

[gbracha, 2014/01/14 01:39:33]

To be clear, the warning stems from the definition of B, not this use.

[regis, 2014/01/14 18:40:45]

Understood. Unfortunately, I do not see how to make the annotation clearer. I
added a comment.

+  new C<int>();  /// 05: ok
+  new C<bool>();  /// 06: static type warning, dynamic type error

[gbracha, 2014/01/14 01:39:33]

as above. In fact, all the warnings are like this. If you care.

[regis, 2014/01/14 18:40:45]

Agreed.

+  new D<int>();  /// 07: static type warning, dynamic type error
+  new D<bool>();  /// 08: static type warning, dynamic type error
+  new E<int>();  /// 09: static type warning, dynamic type error
+  new E<bool>();  /// 10: static type warning, dynamic type error
+}