Pattern Migration 2024: try to suggest eliding redundant binding modifiers #136577
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This aligns the main error message a bit more with the phrasing in the Edition Guide and provides a bit more information on the labels to (hopefully!) aid in understanding.
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Most of these are meant to test possible future improvements, but since they cover cases the existing test suite didn't, I figure including them now may be helpful.
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I've pulled in the tests from #136496. Most of them are targeting changes made in that PR, but the first two apply here too: the first tests that we do rewrite in a case that we can, and the second that we don't in a case that we shouldn't. I figure having the rest is nice too, just to be sure everything here (and in #136475) is working as intended; the existing tests didn't have much coverage involving both deep nesting and multiple bindings, and none involving bindings with subpatterns. |
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…fication, r=Nadrieril Pattern Migration 2024: try to suggest eliding redundant binding modifiers This is based on rust-lang#136475. Only the last commit is new. This is a simpler, more restrictive alternative to rust-lang#136496, meant to partially address rust-lang#136047. If a pattern can be migrated to Rust 2024 solely by removing redundant binding modifiers, this will make that suggestion; otherwise, it uses the old suggestion of making the pattern fully explicit. Relevant tracking issue: rust-lang#131414 `@rustbot` label A-diagnostics A-patterns A-edition-2024 r? `@Nadrieril`
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…iaskrgr Rollup of 8 pull requests Successful merges: - rust-lang#134367 (Stabilize `feature(trait_upcasting)`) - rust-lang#135354 ([Debuginfo] Add MSVC Synthetic and Summary providers to LLDB) - rust-lang#135940 (Update toolstate maintainers) - rust-lang#135945 (Remove some unnecessary parens in `assert!` conditions) - rust-lang#136577 (Pattern Migration 2024: try to suggest eliding redundant binding modifiers) - rust-lang#136598 (Fix suggestion for `dependency_on_unit_never_type_fallback` involving closures + format args expansions) - rust-lang#136653 (Remove dead code from rustc_codegen_llvm and the LLVM wrapper) - rust-lang#136664 (replace one `.map_or(true, ...)` with `.is_none_or(...)`) Failed merges: - rust-lang#136193 (Implement pattern type ffi checks) r? `@ghost` `@rustbot` modify labels: rollup
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…iaskrgr Rollup of 7 pull requests Successful merges: - rust-lang#134367 (Stabilize `feature(trait_upcasting)`) - rust-lang#135940 (Update toolstate maintainers) - rust-lang#135945 (Remove some unnecessary parens in `assert!` conditions) - rust-lang#136577 (Pattern Migration 2024: try to suggest eliding redundant binding modifiers) - rust-lang#136598 (Fix suggestion for `dependency_on_unit_never_type_fallback` involving closures + format args expansions) - rust-lang#136653 (Remove dead code from rustc_codegen_llvm and the LLVM wrapper) - rust-lang#136664 (replace one `.map_or(true, ...)` with `.is_none_or(...)`) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#136577 - dianne:simple-pat-migration-simplification, r=Nadrieril Pattern Migration 2024: try to suggest eliding redundant binding modifiers This is based on rust-lang#136475. Only the last commit is new. This is a simpler, more restrictive alternative to rust-lang#136496, meant to partially address rust-lang#136047. If a pattern can be migrated to Rust 2024 solely by removing redundant binding modifiers, this will make that suggestion; otherwise, it uses the old suggestion of making the pattern fully explicit. Relevant tracking issue: rust-lang#131414 ``@rustbot`` label A-diagnostics A-patterns A-edition-2024 r? ``@Nadrieril``
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Some field data, for anyone considering the beta backport: In a workspace with ~4000 source files, the I find this a meaningful improvement. |
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Beta backport accepted as per compiler team on Zulip but we are still a bit on the fence here, see also previous discussion on Zulip. Probably the most important thing is that if we notice something behaving funny, we should be ready with a .1 backout. And If we don't, we should do a .1 after "enough testing" with this change. (Backport labels handled by T-release) @rustbot label +beta-accepted |
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[beta] backports - Pattern Migration 2024: try to suggest eliding redundant binding modifiers rust-lang#136577, rust-lang#136857 - chore: update rustc-hash 2.1.0 to 2.1.1 rust-lang#136605 - Make `AsyncFnOnce`, `AsyncFnMut`, `AsyncFn` non-`#[fundamental]` rust-lang#136724 - fix ensure_monomorphic_enough rust-lang#136839 - Revert "Stabilize `extended_varargs_abi_support`" rust-lang#136897, rust-lang#136934 r? cuviper
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…tion, r=Nadrieril Pattern Migration 2024: clean up and comment This follows up on rust-lang#136577 by moving the pattern migration logic to its own module, removing a bit of unnecessary complexity, and adding comments. Since there's quite a bit of pattern migration logic now (and potentially more in rust-lang#136496), I think it makes sense to keep it separate from THIR construction, at least as much as is convenient. r? `@Nadrieril`
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…tion, r=Nadrieril Pattern Migration 2024: clean up and comment This follows up on rust-lang#136577 by moving the pattern migration logic to its own module, removing a bit of unnecessary complexity, and adding comments. Since there's quite a bit of pattern migration logic now (and potentially more in rust-lang#136496), I think it makes sense to keep it separate from THIR construction, at least as much as is convenient. r? ``@Nadrieril``
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Rollup merge of rust-lang#136817 - dianne:clean-and-comment-pat-migration, r=Nadrieril Pattern Migration 2024: clean up and comment This follows up on rust-lang#136577 by moving the pattern migration logic to its own module, removing a bit of unnecessary complexity, and adding comments. Since there's quite a bit of pattern migration logic now (and potentially more in rust-lang#136496), I think it makes sense to keep it separate from THIR construction, at least as much as is convenient. r? ``@Nadrieril``
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This is based on #136475. Only the last commit is new.
This is a simpler, more restrictive alternative to #136496, meant to partially address #136047. If a pattern can be migrated to Rust 2024 solely by removing redundant binding modifiers, this will make that suggestion; otherwise, it uses the old suggestion of making the pattern fully explicit.
Relevant tracking issue: #131414
@rustbot label A-diagnostics A-patterns A-edition-2024
r? @Nadrieril