A class can implement another class, so a selector on a class applies to a member that implements t…

tests/language/tree_shake_typed_selector_test.dart

Index: tests/language/tree_shake_typed_selector_test.dart
===================================================================
--- tests/language/tree_shake_typed_selector_test.dart	(revision 0)
+++ tests/language/tree_shake_typed_selector_test.dart	(revision 0)
@@ -0,0 +1,23 @@
+// 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.
+// Check that dart2js emits code for classes that implement another
+// class.
+
+class A {
+  factory A() => new B();
+  foo() => 0;
+}
+
+class B implements A {
+  foo() => 42;
+}
+
+main() {
+  var a = new A();
+  if (a is A) {
+    Expect.equals(42, a.foo());
+  } else {
+    Expect.fail('Should not be here');
+  }
+}