Fix overly permissive borrow checking rules for `&mut &mut`#10519

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bors merged 3 commits intorust-lang:masterfrom

nikomatsakis:issue-8624-borrowck-overly-permissive

Nov 28, 2013

Commits on Nov 25, 2013

Add [mut_]shift_ref/[mut_]pop_ref functions, which return a pointer to the first/last item in the slice and modify the slice to exclude the returned item. Useful when writing iterators over mutable…
nikomatsakis
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Commits on Nov 28, 2013

Modify iterators to make them safe with the new rules.
nikomatsakis
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Test that reborrowing contents of an `&'a mut &'b mut` pointer can only
nikomatsakis
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