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The resolver catches this test with a NO_SUCH_METHOD exception, but if you run with --warn_no_such_type that is not fatal. This change detects the problem with a type variable being used so it doesn't get to code generation. BUG=5433122 Review URL: https://chromereviews.googleplex.com/3578019 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@308 260f80e4-7a28-3924-810f-c04153c831b5