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

tests/compiler/dart2js/tree_shaking_test.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.
+
+#import('compiler_helper.dart');
+
+const String TEST = @"""
+class A {
+  foo() => bar();
+  bar() => 42;
+}
+class B extends A {
+  bar() => 54;
+}
+class C implements A {
+  bar() => 68;
+}
+main() {
+  new A();
+  new B();
+  new C();
+  new A().foo();
+}
+""";
+
+void main() {
+  String generated = compileAll(TEST);
+  Expect.isTrue(generated.contains('return 42'));
+  Expect.isTrue(generated.contains('return 54'));
+  Expect.isFalse(generated.contains('return 68'));
+}