Rollup of 16 pull requests#59151

Merged

bors merged 44 commits intorust-lang:masterfrom

Mar 13, 2019

Commits on Mar 1, 2019

librustc_interface: Update scoped-tls to 1.0
Xanewok
committed

Commits on Mar 4, 2019

Update rand version
JohnTitor
committed

Commits on Mar 8, 2019

Fix documentation of from_ne_bytes and from_le_bytes
xTibor
committed

Commits on Mar 9, 2019

Commits on Mar 10, 2019

Use lifetime contravariance to elide more lifetimes in core+alloc+std
scottmcm
committed

Commits on Mar 12, 2019

Commits on Mar 13, 2019