Rollup of 26 pull requests#57542

Merged

bors merged 73 commits intorust-lang:masterfrom

Jan 12, 2019

Commits on Dec 2, 2018

Redo the docs for Vec::set_len
scottmcm
committed

Commits on Dec 12, 2018

Update the comment some more following CR feedback
scottmcm
committed

Commits on Dec 21, 2018

Sidestep ICE in `FieldPlacement::count` by not calling it when count will not fit in host's usize.
pnkfelix
committed

Commits on Jan 3, 2019

Commits on Jan 6, 2019

Use CMAKE_{C,CXX}_COMPILER_LAUNCHER for ccache
petrhosek
committed

Commits on Jan 9, 2019

Commits on Jan 12, 2019