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But it should not be returned as 'void'. It should be an empty string, as any other method with unknown return type. I guess we could improve this in the future, e.g. promote type of a returned expression into the signature. R=brianwilkerson@google.com BUG= Review URL: https://codereview.chromium.org//970063002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44177 260f80e4-7a28-3924-810f-c04153c831b5