cleanup: use the `for x in &xs` form instead of `for x in xs.iter()`#21830

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bors merged 7 commits intorust-lang:masterfrom

japaric:for-cleanup

Feb 3, 2015

Commits on Feb 2, 2015

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Jorge Aparicio
committed
impl IntoIterator for HashMap
Jorge Aparicio
committed
impl IntoIterator for HashSet
Jorge Aparicio
committed
`for x in xs.iter()` -> `for x in &xs`
Jorge Aparicio
committed
`for x in xs.iter_mut()` -> `for x in &mut xs`
Jorge Aparicio
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`for x in xs.into_iter()` -> `for x in xs`
Jorge Aparicio
committed
remove unused mut qualifiers
Jorge Aparicio
committed