Rollup of 11 pull requests#30826

Merged

bors merged 26 commits intorust-lang:masterfrom

Jan 12, 2016

Commits on Jan 4, 2016

Undo whitespace tweaks pending libbacktrace merge
mmcco
committed

Commits on Jan 6, 2016

Stop re-exporting MutateMode's variants.
Ms2ger
committed

Commits on Jan 7, 2016

Commits on Jan 8, 2016

Change destination accessor to return references
nagisa
committed

Commits on Jan 9, 2016

Fix a typo in rustc_mir::build::scope's documentation
erickt
committed

Commits on Jan 10, 2016

Commits on Jan 11, 2016