Rollup of 5 pull requests#57955

Closed

Centril wants to merge 10 commits into

rust-lang:masterfrom

Commits on Jan 22, 2019

Print a slightly clearer message when failing to spawn a thread
Jethro Beekman
committed

Commits on Jan 23, 2019

Fix invalid background color
GuillaumeGomez
committed

Commits on Jan 26, 2019

Pretty print `$crate` as `crate` or `crate_name` in more cases
petrochenkov
committed

Commits on Jan 28, 2019