Mixin test to repro issue 11803

tests/language/mixin_type_parameters_simple_test.dart

Index: tests/language/mixin_type_parameters_simple_test.dart
===================================================================
--- tests/language/mixin_type_parameters_simple_test.dart	(revision 0)
+++ tests/language/mixin_type_parameters_simple_test.dart	(revision 0)
@@ -0,0 +1,26 @@
+// Copyright (c) 2013, 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.
+
+import "package:expect/expect.dart";
+
+class S {}
+
+class M1<X> {
+  m1() => X;
+}
+
+class M2<Y> {
+  m2() => Y;
+}
+
+class A<T> extends S with M1<T> , M2<T> { }
+
+main() {
+  var a = new A<int>();
+  Expect.equals("int", a.m1().toString());
+  Expect.equals("int", a.m2().toString());
+  a = new A<String>();
+  Expect.equals("String", a.m1().toString());
+  Expect.equals("String", a.m2().toString());
+}