Rollup of 6 pull requests#67142

Closed

Centril wants to merge 24 commits intorust-lang:masterfrom

Centril:rollup-co72dts

Commits on Dec 3, 2019

Fix TypedArena.
cjgillot
committed

Commits on Dec 4, 2019

Update tokio crates to latest versions
mati865
committed

Commits on Dec 6, 2019

Commits on Dec 7, 2019

Commits on Dec 8, 2019