rust/compiler/rustc_parse
Matthias Krüger 4ed2291624
Rollup merge of #116393 - compiler-errors:auto-bad, r=WaffleLapkin
Emit feature gate *warning* for `auto` traits pre-expansion

Auto traits were introduced before we were more careful about not stabilizing new syntax pre-expansion.

This is a more conservative step in the general direction we want to go in https://rust-lang.zulipchat.com/#narrow/stream/213817-t-lang/topic/Removal.20of.20.60auto.20trait.60.20syntax.

Fixes #116121
2023-10-04 05:02:07 +02:00
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