Check type argument bounds of interfaces in type tests (work in progress).

tests/language/src/TypeVariableBounds2Test.dart

+// Copyright (c) 2012, 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.
+
+// Test of parameterized types with invalid bounds.
+
+interface I<T extends num> { }
+
+interface J<T> { }
+
+interface K<T> { }
+
+class A<T> implements I<T>, J<T> {
+}
+
+main() {
+  var a = new A<String>();
+
+  {
+    I i = a;  /// 00: dynamic type error
+    J j = a;  /// 01: static type error
+    K k = a;  /// 02: dynamic type error
+
+    // In production mode, A<String> is subtype of I, but error in checked mode.
+    var x = a is I;  /// 03: dynamic type error
+
+    // In both production and checked modes, A<String> is a subtype of I.
+    Expect.isTrue(a is J);  /// 04: static type error
+
+    // In both production and checked modes, A<String> is not a subtype of K.
+    Expect.isTrue(a is !K);  /// 05: static type error
+  }
+
+  a = new A<int>();
+
+  {
+    I i = a;
+    J j = a;
+    K k = a;  /// 06: dynamic type error
+
+    // In both production and checked modes, A<int> is a subtype of I.
+    Expect.isTrue(a is I);
+
+    // In both production and checked modes, A<int> is a subtype of J.
+    Expect.isTrue(a is J);
+
+    // In both production and checked modes, A<int> is not a subtype of K.
+    Expect.isTrue(a is !K);
+  }
+}