Solves various problems, [e.g.](https://github.com/rust-lang/rust/issues/21833#issuecomment-72353044)
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kmcallister commentedon Feb 7, 2015
cc @sfackler
sfackler commentedon Feb 8, 2015
cc #19372
rollup merge of rust-lang#22116: kmcallister/cfg_attr