Add some feature gates
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//! [2]: https://github.com/BurntSushi/toml-test
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//!
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#![feature(collections, core)]
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#![deny(missing_docs)]
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#![cfg_attr(test, deny(warnings))]
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#![cfg_attr(test, allow(unstable))]
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extern crate "rustc-serialize" as rustc_serialize;
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