Rollup merge of #121256 - Jarcho:visitor2, r=oli-obk

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Allow AST and HIR visitors to return `ControlFlow`

Alternative to #108598.

Since rust-lang/libs-team#187 was rejected, this implements our own version of the `Try` trait (`VisitorResult`) and the `try` macro (`try_visit`). Since this change still allows visitors to return `()`, no changes have been made to the existing ones. They can be done in a separate PR.

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Nilstrieb 2024-02-20 07:35:47 +01:00 committed by GitHub

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