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http://code.google.com/p/dart/issues/detail?id=8051 Unfortunately testing framework expects exactly 0 and 1. So, I've made 0/1/2 exit codes optional. Phil, FYI R=devoncarew@google.com,pquitslund@google.com BUG= Review URL: https://codereview.chromium.org//12045088 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@17629 260f80e4-7a28-3924-810f-c04153c831b5