Report compile-time errors for conflicting overrides as specified by latest

tests/language/getter_override_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.
+
+// Test that we report a compile-time error when a static getter conflicts with
+// an inherited instance member of the same name.
+
+import "package:expect/expect.dart";
+
+class A {
+  var foo = 42;  /// 00: compile-time error
+  get foo => 42;  /// 01: compile-time error
+  foo() => 42;  /// 02: compile-time error
+  set foo(value) { }  /// 03: static type warning
+}
+
+class B extends A {
+  static get foo => 42;
+}
+
+main() {
+  Expect.equals(42, B.foo);
+}