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Add test (negative tests still missing). Some more work is needed regarding when to throw a dynamic error and when to report a compile-time error. Some questions are not answered by the spec. Review URL: https://codereview.chromium.org//10964058 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@12791 260f80e4-7a28-3924-810f-c04153c831b5