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scenarios where the resolution was incorrect, but we were still able to generate valid code. We should not stop the whole build process on these cases. (see for example https://code.google.com/p/dart/issues/detail?id=17914). R=blois@google.com Review URL: https://codereview.chromium.org//221673005 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@34656 260f80e4-7a28-3924-810f-c04153c831b5