never patterns: Document behavior of never patterns with macros-by-example#119622
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bors merged 1 commit intorust-lang:masterfrom Jan 5, 2024
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never patterns: Document behavior of never patterns with macros-by-example#119622bors merged 1 commit intorust-lang:masterfrom
bors merged 1 commit intorust-lang:masterfrom
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| macro_rules! detect_pat { | ||
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Wait, weren't the pat macro metavar matchers adjusted for editions >= 2021? Please make an //edition:2021 version of this test.
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Oh shoot well spotted that does have a different behavior. Still backwards-compatible, but a bit inconsistent :/
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Yup, I checked on the playground, this is backwards-compatible. And in fact the assymetry of ! | true vs true | ! in edition 2021 can't be changed
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@bors r=compiler-errors |
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…iaskrgr Rollup of 8 pull requests Successful merges: - rust-lang#119151 (Hide foreign `#[doc(hidden)]` paths in import suggestions) - rust-lang#119350 (Imply outlives-bounds on lazy type aliases) - rust-lang#119354 (Make `negative_bounds` internal & fix some of its issues) - rust-lang#119506 (Use `resolutions(()).effective_visiblities` to avoid cycle errors in `report_object_error`) - rust-lang#119554 (Fix scoping for let chains in match guards) - rust-lang#119563 (Check yield terminator's resume type in borrowck) - rust-lang#119589 (cstore: Remove unnecessary locking from `CrateMetadata`) - rust-lang#119622 (never patterns: Document behavior of never patterns with macros-by-example) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#119622 - Nadrieril:never_patterns_macros, r=compiler-errors never patterns: Document behavior of never patterns with macros-by-example `never_patterns` makes `!` parse as a pattern so I was worried about breaking macros-by-example matching. Turns out we're fine because the cases that now match `$p:pat` used to error in the past. The only tricky case is `!` by itself, which backwards-compatibly doesn't match `$p:pat`. I have no idea why tho, I didn't think of that when I was implementing parsing 😅. This adds tests so we don't regress the current behavior. r? `@compiler-errors`
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never_patternsmakes!parse as a pattern so I was worried about breaking macros-by-example matching. Turns out we're fine because the cases that now match$p:patused to error in the past. The only tricky case is!by itself, which backwards-compatibly doesn't match$p:pat. I have no idea why tho, I didn't think of that when I was implementing parsing 😅.This adds tests so we don't regress the current behavior.
r? @compiler-errors