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embedded source compatibility #4

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@dhardy

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@dhardy

This crate requires std::io code on many platforms to read from special devices, therefore will normally require std. Ideally we should provide a smooth route to no_std compatibility however, possibly by allowing users to define extern functions. (We've discussed using "lang items" but these are restricted to Rust's core libraries; we may or may not integrate this code into std in the future and use that option, but ideally should have a no_std option now.)

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