Match ergonomics 2024: mut doesn't reset binding mode
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Nadrieril
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| @@ -529,6 +529,8 @@ declare_features! ( | |||
| (unstable, more_qualified_paths, "1.54.0", Some(86935)), | |||
| /// Allows the `#[must_not_suspend]` attribute. | |||
| (unstable, must_not_suspend, "1.57.0", Some(83310)), | |||
| /// Make `mut` not reset the binding mode on edition >= 2024. | |||
| (unstable, mut_dont_reset_binding_mode_2024, "CURRENT_RUSTC_VERSION", Some(123076)), | |||
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This should be incomplete instead of unstable
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Maybe mut_preserve_binding_mode_2024 to avoid the double negation? I'm fine either way.
compiler/rustc_hir_typeck/src/pat.rs
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| BindingAnnotation(ByRef::No, Mutability::Not) => def_bm, | ||
| _ => ba, | ||
| BindingAnnotation(ByRef::No, Mutability::Mut) | ||
| if !(pat.span.at_least_rust_2024() | ||
| && self.tcx.features().mut_dont_reset_binding_mode_2024) | ||
| && matches!(def_br, ByRef::Yes(_)) => | ||
| { | ||
| // `mut x` resets the binding mode in edition <= 2021. | ||
| BindingAnnotation(ByRef::No, Mutability::Mut) | ||
| } | ||
| BindingAnnotation(ByRef::No, mutbl) => BindingAnnotation(def_br, mutbl), | ||
| BindingAnnotation(ByRef::Yes(_), _) => ba, |
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This doesn't preserve old behavior in the case where ba is BindingAnnotation(ByRef::No, Mutability::Not) and def_bm.1 is Mutability::Mut. I guess that can't happen, right? Could we store just a ByRef in PatInfo?
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Could we store just a
ByRefinPatInfo?
I think we can, but it would require changes to calc_default_binding_mode, so I'll do it in a later PR so as not to conflict with #123512
Nadrieril
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Apr 13, 2024
| @@ -529,6 +529,8 @@ declare_features! ( | |||
| (unstable, more_qualified_paths, "1.54.0", Some(86935)), | |||
| /// Allows the `#[must_not_suspend]` attribute. | |||
| (unstable, must_not_suspend, "1.57.0", Some(83310)), | |||
| /// Make `mut` not reset the binding mode on edition >= 2024. | |||
| (unstable, mut_dont_reset_binding_mode_2024, "CURRENT_RUSTC_VERSION", Some(123076)), | |||
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Maybe mut_preserve_binding_mode_2024 to avoid the double negation? I'm fine either way.
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☔ The latest upstream changes (presumably #123991) made this pull request unmergeable. Please resolve the merge conflicts. |
Rustfix remains TODO
The lint is unstable, and the lint group `rust_2024_compatibility` must keep working on stable
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Nadrieril
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Apr 16, 2024
|
@bors r+ |
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…ding_mode_2024, r=Nadrieril Match ergonomics 2024: `mut` doesn't reset binding mode r? `@Nadrieril` cc rust-lang#123076 `@rustbot` label A-edition-2024 A-patterns
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…iaskrgr Rollup of 10 pull requests Successful merges: - rust-lang#122632 (fetch submodule before checking llvm stamp) - rust-lang#123355 (Support type '/' to search) - rust-lang#123501 (Stabilize checking of cfgs at compile-time: `--check-cfg` option) - rust-lang#123535 (Match ergonomics 2024: `mut` doesn't reset binding mode) - rust-lang#123711 (drop `changelog-seen`) - rust-lang#123969 (The new solver ignores `DefineOpaqueTypes`, so switch it to `Yes`) - rust-lang#124007 (Miri subtree update) - rust-lang#124017 (Change a diagnostics-path-only `DefineOpaqueTypes` to `Yes`.) - rust-lang#124018 (interpret: pass MemoryKind to before_memory_deallocation) - rust-lang#124024 (interpret: remove outdated comment) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#123535 - Jules-Bertholet:mut_dont_reset_binding_mode_2024, r=Nadrieril Match ergonomics 2024: `mut` doesn't reset binding mode r? ``@Nadrieril`` cc rust-lang#123076 ``@rustbot`` label A-edition-2024 A-patterns
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r? @Nadrieril
cc #123076
@rustbot label A-edition-2024 A-patterns