bors 47d1cdb0bc Auto merge of #100574 - Urgau:check-cfg-warn-cfg, r=petrochenkov
Add warning against unexpected --cfg with --check-cfg

This PR adds a warning when an unexpected `--cfg` is specified but not in the specified list of `--check-cfg`.

This is the follow-up PR I mentioned in https://github.com/rust-lang/rust/pull/99519.

r? `@petrochenkov`
2022-09-03 12:02:14 +00:00
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