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3e634f8c5c
Use `ControlFlow` in visitors. Follow up to #121256 This does have a few small behaviour changes in some diagnostic output where the visitor will now find the first match rather than the last match. The change in `find_anon_types.rs` has the only affected test. I don't see this being an issue as the last occurrence isn't any better of a choice than the first.
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.