Rollup of 9 pull requests#73387

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Dylan-DPC-zz wants to merge 20 commits intorust-lang:masterfrom

Dylan-DPC-zz:rollup-6xjwe4r

Commits on May 26, 2020

Add tests for 'impl Default for [T; N]'
MikailBag
committed

Commits on May 28, 2020

Skip leak test on targets without panic=unwind
MikailBag
committed

Commits on Jun 8, 2020

Ensure std benchmarks get tested.
ehuss
committed

Commits on Jun 13, 2020

lint: normalize projections using opaque types
davidtwco
committed

Commits on Jun 14, 2020

Don't run generator transform when there's a TyErr
jonas-schievink
committed

Commits on Jun 15, 2020