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Rollup merge of rust-lang#127808 - oli-obk:tainting_visitors2, r=lcnr,nnethercote Make ErrorGuaranteed discoverable outside types, consts, and lifetimes types like `PatKind` could contain `ErrorGuaranteed`, but not return them via `tainted_by_errors` or `error_reported` (see rust-lang#127687 (comment)). Now this happens, but it's a bit fragile as you can see with the `TypeSuperVisitable for Ty` impl. We will catch any problems around Ty, Region or Const at runtime with an assert, and everything using derives will not have such issues, as it will just invoke the `TypeVisitable for ErrorGuaranteed` impl
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