Migrate to tail expression temporary lifetime rule in Edition 2024 #3066
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davidbarsky
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Aug 29, 2024
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hawkw
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Aug 29, 2024
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@hawkw Thanks for the suggestion. I feel that leaving comments in the macro body would make them stay in the macro expansion, so I took the liberty to lift the explanation to the top of the macro definition. Hopefully this is clear enough to explain the use of |
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Motivation
Related to rust-lang/rust#123739
This is a migration effort to prepare
tracingmacros to be more Edition 2024 oriented.This change is backward-compatible so that the macro works exactly the same in terms of program semantics in both Edition 2018 and prospective Edition 2024.
cc @jieyouxu @traviscross
Solution
valueset!is replaced withvalueset_arr!which must be used at thematchscrutinee location.__tracing_log!macro is written to take a "continuation" so that the&'_ ValueSetis generated and passed into the expanded code only when the logger is enabled.