RFC: Introduce Mut<T>, remove Cell<T>#9429

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bluss wants to merge 8 commits intorust-lang:masterfrom

bluss:mutable-t

Commits on Sep 23, 2013

Introduce std::mutable with Mut<T>, a mutable slot
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extra::rc: Replace RcMut<T> with Rc<Mut<T>>
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Port users of Cell::with_mut_ref to use Mut<T>
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Port users of Cell::put_back to Mut<T>
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Replace Cell with Mut
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Commits on Sep 24, 2013

std::mutable: shrink the size of the BorrowFlag in Mut<T>
blake2-ppc
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Update tutorial to mention "Mut"
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Fixup use std::mutable::Mut
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