Rollup of 10 pull requests#57911

Closed

Centril wants to merge 30 commits intorust-lang:masterfrom

Commits on Jan 17, 2019

Commits on Jan 18, 2019

test that wildcard type `_` is not duplicated by `type Foo<X> = (X, X);` and potentially instantiated at different types.
pnkfelix
committed

Commits on Jan 19, 2019

Commits on Jan 21, 2019

un-deprecate mem::zeroed
RalfJung
committed

Commits on Jan 22, 2019

Ignore aarch64 in simd-intrinsic-generic-reduction
James Duley
committed

Commits on Jan 23, 2019

Commits on Jan 24, 2019

Commits on Jan 25, 2019

Commits on Jan 26, 2019