Add mirror tests for generic interfaces. Add base-language test for malbounded interfaces.

tests/language/malbounded_type_cast_test.dart

Index: tests/language/malbounded_type_cast_test.dart
diff --git a/tests/language/malbounded_type_cast_test.dart b/tests/language/malbounded_type_cast_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..0b54850fed840856ff5b6f54dbe38e35af78c29f
--- /dev/null
+++ b/tests/language/malbounded_type_cast_test.dart
@@ -0,0 +1,30 @@
+// 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 Super<T extends num> {}
+class Malbounded1 implements Super<String> {}  /// static type warning
+class Malbounded2 extends Super<String> {}  /// static type warning
+
+main() {
+  bool inCheckedMode = false;
+  try {
+    String a = 42;
+  } catch (e) {
+    inCheckedMode = true;
+  }
+
+  var expectedError;
+  if (inCheckedMode) {
+  	expectedError = (e) => e is TypeError;
+  } else {
+  	expectedError = (e) => e is CastError;
+  }
+
+  var s = new Super<int>();
+  Expect.throws(() => s as Malbounded1, expectedError);  /// static type warning
+  Expect.throws(() => s as Malbounded2, expectedError);  /// static type warning
+  Expect.throws(() => s as Super<String>, expectedError); /// static type warning
+}