Rollup of 5 pull requests#47225

Merged

bors merged 12 commits intorust-lang:masterfrom

GuillaumeGomez:rollup

Jan 6, 2018

Commits on Dec 24, 2017

Minor rewrite of env::current_exe docs; clarify symlinks.
frewsxcv
committed

Commits on Jan 5, 2018