auto: librustc: Allow mutable box substructure to be borrowed without requirin...#4826

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pcwalton wants to merge 1 commit intorust-lang:incomingfrom pcwalton:inhtwama-substructure

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Commits on Feb 7, 2013

librustc: Allow mutable box substructure to be borrowed without requiring purity. Closes rust-lang#4825 .
pcwalton
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