bors 7cd9bf5af3 Auto merge of #7866 - rust-lang:edition-2021-tests, r=Manishearth
update most tests to 2021 edition

Some tests would no longer work at all, so I added `edition:2015` or `edition:2018` to them.

Notably 2021 panics are not yet detected correctly. Once ready, this closes #7842.

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changelog: none
2021-11-01 15:18:57 +00:00
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2021-10-30 14:50:53 +02:00