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In addition, modify the code generation so that these protocol violations will be caught by assertions during unit tests. Previously, they would only be caught at runtime by client code. R=brianwilkerson@google.com, scheglov@google.com Review URL: https://codereview.chromium.org//1083223003 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@45211 260f80e4-7a28-3924-810f-c04153c831b5