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stabilize format args capture by joshtriplett · Pull Request #90473 · rust-lang/...
source link: https://github.com/rust-lang/rust/pull/90473
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Works as expected, and there are widespread reports of success with it, as well as interest in it.
RFC: rust-lang/rfcs#2795
Tracking issue: #67984
Addressing items from the tracking issue:
- We don't support capturing arguments from a non-literal format string like
format_args!(concat!(...)). We could add that in a future enhancement, or we can decide that it isn't supported (as suggested in #67984 (comment) ). - I've updated the documentation.
panic!now supports capture as well.- There are potentially opportunities to further improve diagnostics for invalid usage, such as if it looks like the user tried to use an expression rather than a variable. However, such cases are all already caught and provide reasonable syntax errors now, and we can always provided even friendlier diagnostics in the future.
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