Add a used attribute#1459

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mahkoh wants to merge 5 commits intorust-lang:masterfrom

Commits on Jan 11, 2016

used
mahkoh
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fix typo
mahkoh
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Commits on Jan 16, 2016

preserve
mahkoh
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Commits on Jan 17, 2016

update
mahkoh
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Commits on Jan 19, 2016

alt
mahkoh
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