Replace old iterator `for` with `do { .. }` expressions in std and extra#8159

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bluss wants to merge 8 commits intorust-lang:masterfrom bluss:for-to-do

+522-508

Commits on Aug 1, 2013

std: Use do blocks instead of for with .iter_bytes()
blake2-ppc
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extra: Use do instead of for in extra::iter
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std: Replace for with do { .. } expr where internal iterators are used
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extra: Replace for with do { .. } expr where internal iterators are used
blake2-ppc
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extra: Use external iterators in bitv implementation
blake2-ppc
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std: Remove the internal iterator methods from trait Set
blake2-ppc
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std: Replace for with do { .. } expr in std::gc
blake2-ppc
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std: Change Times trait to use do instead of for
blake2-ppc
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