Rollup of 6 pull requests#67326

Closed

Centril wants to merge 16 commits intorust-lang:masterfrom

Centril:rollup-sdv2jlj

Commits on Nov 21, 2019

Stabilize `std::{rc,sync}::Weak::{weak_count, strong_count}`
Bryan Donlan
committed
Make Weak::weak_count() return zero when no strong refs remain
Bryan Donlan
committed

Commits on Dec 2, 2019

Commits on Dec 14, 2019

Indicate origin of where type parameter for uninferred types
ohadravid
committed

Commits on Dec 15, 2019