Rollup of 9 pull requests#64932

Merged

bors merged 25 commits into

rust-lang:masterfrom

tmandry:rollup-7t8x1nz

Oct 1, 2019

Commits on Sep 29, 2019

Fix `vec![x; n]` with null raw fat pointer zeroing the pointer metadata
SimonSapin
committed
Zero-initialize `vec![None; n]` for `Option<&T>`, `Option<&mut T>` and `Option<Box<T>>`
SimonSapin
committed
Use https for curl when building for linux
tmandry
committed

Commits on Sep 30, 2019