Harden bad placeholder checks on statics/consts Resubmission of #89161 Fixes https://github.com/rust-lang/rust/issues/88643 In #83739, I added a check for trait objects on statics/consts but it wasn't robust. `is_suggestable_infer_ty` fn does a more strict check and finds more bad placeholders. See https://github.com/rust-lang/rust/pull/89161#issuecomment-934690300 for the more detailed explanation. r? `@pnkfelix` as you're the reviewer of the previous PR |
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For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.