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Replace all `&DiagCtxt` with a `DiagCtxtHandle<'_>` wrapper type r? `@davidtwco` This paves the way for tracking more state (e.g. error tainting) in the diagnostic context handle Basically I will add a field to the `DiagCtxtHandle` that refers back to the `InferCtxt`'s (and others) `Option<ErrorHandled>`, allowing us to immediately taint these contexts when emitting an error and not needing manual tainting anymore (which is easy to forget and we don't do in general anyway)