Rollup of 5 pull requests#63936

Closed

Centril wants to merge 18 commits intorust-lang:masterfrom

Centril:rollup-87mvvmq

Commits on Jul 11, 2019

libtest: add --show-output option
Paul Emmerich
committed
libtest: support display_output in JSON formatter
Paul Emmerich
committed

Commits on Aug 19, 2019

Commits on Aug 20, 2019

Commits on Aug 24, 2019

Add default serialization for `Ident`s
matthewjasper
committed