Disallow mixing in classes that use 'super'.

tests/language/mixin_illegal_super_use_test.dart

+// 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.
+
+class M {
+}
+
+class P0 {
+  foo() {
+    super.toString();    /// 01: compile-time error
+    super.foo();         /// 02: compile-time error
+    super.bar = 100;     /// 03: compile-time error
+
+    void inner() {
+      super.toString();  /// 04: compile-time error
+      super.foo();       /// 05: compile-time error
+      super.bar = 100;   /// 06: compile-time error
+    }
+    inner();
+
+    (() {
+      super.toString();  /// 07: compile-time error
+      super.foo();       /// 08: compile-time error
+      super.bar = 100;   /// 09: compile-time error
+    })();
+
+    return 42;
+  }
+}
+
+class P1 {
+  bar() {
+    super.toString();    /// 10: compile-time error
+    return 87;
+  }
+
+  // The test method is strategically placed here to try to force the
+  // P1 class and its bar method to be resolved before resolving the
+  // mixin applications.
+  test() {
+    new C();
+    var d = new D();
+    var e = new E();
+    var f = new F();
+    Expect.equals(42, d.foo());
+    Expect.equals(87, e.bar());
+    Expect.equals(99, f.baz());
+  }
+}
+
+class P2 {
+  baz() {
+    super.toString();   /// 11: compile-time error
+    return 99;
+  }
+}
+
+typedef C = Object with M;
+typedef D = Object with P0;
+typedef E = Object with M, P1;
+typedef F = Object with P2, M;
+
+main() {
+  var p1 = new P1();
+  var p2 = new P2();
+  Expect.equals(87, p1.bar());
+  p1.test();
+  Expect.equals(99, p2.baz());
+}