Rollup of 13 pull requests#65368

Merged

bors merged 33 commits intorust-lang:masterfrom

Centril:rollup-lb7fe48

Oct 13, 2019

Commits on Oct 3, 2019

Document current deny by default lints
197g
committed

Commits on Oct 9, 2019

Suggest `if let` on `let` refutable binding
estebank
committed

Commits on Oct 12, 2019

Commits on Oct 13, 2019