Rollup of 3 pull requests#42968

Closed

frewsxcv wants to merge 19 commits intorust-lang:masterfrom

frewsxcv:rollup

Commits on Jun 27, 2017

Document possible `io::ErrorKind`s of `fs::open`
tbu-
committed
Update RLS submodule
Nick Cameron
committed

Commits on Jun 28, 2017

Add links to the `ErrorKind` variants in errors of `open`
tbu-
committed

Commits on Jun 29, 2017