Rollup of 9 pull requests#61296

Merged

bors merged 40 commits intorust-lang:masterfrom

Centril:rollup-5ad68b0

May 29, 2019

Commits on May 18, 2019

Add better tests for hidden lifetimes in impl trait
matthewjasper
committed

Commits on May 21, 2019

tests: Centralize proc macros commonly used for testing
petrochenkov
committed

Commits on May 25, 2019

Commits on May 26, 2019

Print file mode of PermissionExt in octal in Examples
oberien
committed

Commits on May 28, 2019