Uplift `clippy::double_neg` lint as `double_negations` #126604

kadiwa4 · 2024-06-17T18:13:33Z

Warns about cases like this:

fn main() {
    let x = 1;
    let _b = --x; //~ WARN use of a double negation
}

The intent is to keep people from thinking that --x is a prefix decrement operator. ++x, x++ and x-- are invalid expressions and already have a helpful diagnostic.

I didn't add a machine-applicable suggestion to the lint because it's not entirely clear what the programmer was trying to achieve with the --x operation. The code that triggers the lint should always be reviewed manually.

Closes #82987

rustbot · 2024-06-17T18:13:40Z

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rustbot · 2024-06-17T18:13:42Z

Some changes occurred in src/tools/clippy

cc @rust-lang/clippy

compiler/rustc_lint/src/builtin.rs

kadiwa4 · 2024-06-18T13:49:55Z

@rustbot author

nnethercote · 2024-06-19T05:54:51Z

This needs T-lang approval. The appropriate labels have been applied to summon them.

bors · 2024-06-30T22:27:12Z

☔ The latest upstream changes (presumably #127174) made this pull request unmergeable. Please resolve the merge conflicts.

kadiwa4 · 2024-09-01T19:37:24Z

@rustbot ready

nnethercote · 2024-09-01T22:15:32Z

Still waiting on T-lang, AFAICT.

kadiwa4 · 2024-09-30T11:07:05Z

@rustbot label: -S-waiting-on-review +S-waiting-on-team

bors · 2024-10-29T03:52:36Z

☔ The latest upstream changes (presumably #128985) made this pull request unmergeable. Please resolve the merge conflicts.

bors · 2025-01-26T03:54:11Z

☔ The latest upstream changes (presumably #136070) made this pull request unmergeable. Please resolve the merge conflicts.

kadiwa4 · 2025-01-26T11:22:29Z

@rustbot label: -S-waiting-on-team +S-waiting-on-review -I-lang-nominated

nnethercote · 2025-01-26T21:59:01Z

Updated code looks fine to me. I think/hope this has gone through all the appropriate hoops and is ready to be merged.

@bors r+

bors · 2025-01-26T21:59:04Z

📌 Commit c1dcbeb has been approved by nnethercote

It is now in the queue for this repository.

Rollup of 8 pull requests Successful merges: - rust-lang#126604 (Uplift `clippy::double_neg` lint as `double_negations`) - rust-lang#135158 (Add `TooGeneric` variant to `LayoutError` and emit `Unknown`) - rust-lang#135635 (Move `std::io::pipe` code into its own file) - rust-lang#136072 (add two old crash tests) - rust-lang#136079 (compiler_fence: fix example) - rust-lang#136091 (Add some tracing to core bootstrap logic) - rust-lang#136097 (rustc_ast: replace some len-checks + indexing with slice patterns etc.) - rust-lang#136101 (triagebot: set myself on vacation) r? `@ghost` `@rustbot` modify labels: rollup

Rollup merge of rust-lang#126604 - kadiwa4:uplift_double_negation, r=nnethercote Uplift `clippy::double_neg` lint as `double_negations` Warns about cases like this: ```rust fn main() { let x = 1; let _b = --x; //~ WARN use of a double negation } ``` The intent is to keep people from thinking that `--x` is a prefix decrement operator. `++x`, `x++` and `x--` are invalid expressions and already have a helpful diagnostic. I didn't add a machine-applicable suggestion to the lint because it's not entirely clear what the programmer was trying to achieve with the `--x` operation. The code that triggers the lint should always be reviewed manually. Closes rust-lang#82987

…nnethercote Uplift `clippy::double_neg` lint as `double_negations` Warns about cases like this: ```rust fn main() { let x = 1; let _b = --x; //~ WARN use of a double negation } ``` The intent is to keep people from thinking that `--x` is a prefix decrement operator. `++x`, `x++` and `x--` are invalid expressions and already have a helpful diagnostic. I didn't add a machine-applicable suggestion to the lint because it's not entirely clear what the programmer was trying to achieve with the `--x` operation. The code that triggers the lint should always be reviewed manually. Closes rust-lang#82987

fmease · 2025-02-02T01:59:52Z

@bors r- ('fixing' desync)

Rollup of 8 pull requests Successful merges: - rust-lang#126604 (Uplift `clippy::double_neg` lint as `double_negations`) - rust-lang#135158 (Add `TooGeneric` variant to `LayoutError` and emit `Unknown`) - rust-lang#135635 (Move `std::io::pipe` code into its own file) - rust-lang#136072 (add two old crash tests) - rust-lang#136079 (compiler_fence: fix example) - rust-lang#136091 (Add some tracing to core bootstrap logic) - rust-lang#136097 (rustc_ast: replace some len-checks + indexing with slice patterns etc.) - rust-lang#136101 (triagebot: set myself on vacation) r? `@ghost` `@rustbot` modify labels: rollup

Upstream changes relative to 1.85.1: Version 1.86.0 (2025-04-03) ========================== Language -------- - [Stabilize upcasting trait objects to supertraits.] (rust-lang/rust#134367) - [Allow safe functions to be marked with the `#[target_feature]` attribute.] (rust-lang/rust#134090) - [The `missing_abi` lint now warns-by-default.] (rust-lang/rust#132397) - Rust now lints about double negations, to catch cases that might have intended to be a prefix decrement operator (`--x`) as written in other languages. This was previously a clippy lint, `clippy::double_neg`, and is [now available directly in Rust as `double_negations`.] (rust-lang/rust#126604) - [More pointers are now detected as definitely not-null based on their alignment in const eval.] (rust-lang/rust#133700) - [Empty `repr()` attribute applied to invalid items are now correctly rejected.] (rust-lang/rust#133925) - [Inner attributes `#![test]` and `#![rustfmt::skip]` are no longer accepted in more places than intended.] (rust-lang/rust#134276) Compiler -------- - [Debug-assert that raw pointers are non-null on access.] (rust-lang/rust#134424) - [Change `-O` to mean `-C opt-level=3` instead of `-C opt-level=2` to match Cargo's defaults.] (rust-lang/rust#135439) - [Fix emission of `overflowing_literals` under certain macro environments.] (rust-lang/rust#136393) Platform Support ---------------- - [Replace `i686-unknown-redox` target with `i586-unknown-redox`.] (rust-lang/rust#136698) - [Increase baseline CPU of `i686-unknown-hurd-gnu` to Pentium 4.] (rust-lang/rust#136700) - New tier 3 targets: - [`{aarch64-unknown,x86_64-pc}-nto-qnx710_iosock`] (rust-lang/rust#133631). For supporting Neutrino QNX 7.1 with `io-socket` network stack. - [`{aarch64-unknown,x86_64-pc}-nto-qnx800`] (rust-lang/rust#133631). For supporting Neutrino QNX 8.0 (`no_std`-only). - [`{x86_64,i686}-win7-windows-gnu`] (rust-lang/rust#134609). Intended for backwards compatibility with Windows 7. `{x86_64,i686}-win7-windows-msvc` are the Windows MSVC counterparts that already exist as Tier 3 targets. - [`amdgcn-amd-amdhsa`](rust-lang/rust#134740). - [`x86_64-pc-cygwin`](rust-lang/rust#134999). - [`{mips,mipsel}-mti-none-elf`] (rust-lang/rust#135074). Initial bare-metal support. - [`m68k-unknown-none-elf`](rust-lang/rust#135085). - [`armv7a-nuttx-{eabi,eabihf}`, `aarch64-unknown-nuttx`, and `thumbv7a-nuttx-{eabi,eabihf}`] (rust-lang/rust#135757). Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - The type of `FromBytesWithNulError` in `CStr::from_bytes_with_nul(bytes: &[u8]) -> Result<&Self, FromBytesWithNulError>` was [changed from an opaque struct to an enum] (rust-lang/rust#134143), allowing users to examine why the conversion failed. - [Remove `RustcDecodable` and `RustcEncodable`.] (rust-lang/rust#134272) - [Deprecate libtest's `--logfile` option.] (rust-lang/rust#134283) - [On recent versions of Windows, `std::fs::remove_file` will now remove read-only files.] (rust-lang/rust#134679) Stabilized APIs --------------- - [`{float}::next_down`] (https://doc.rust-lang.org/stable/std/primitive.f64.html#method.next_down) - [`{float}::next_up`] (https://doc.rust-lang.org/stable/std/primitive.f64.html#method.next_up) - [`<[_]>::get_disjoint_mut`] (https://doc.rust-lang.org/stable/std/primitive.slice.html#method.get_disjoint_mut) - [`<[_]>::get_disjoint_unchecked_mut`] (https://doc.rust-lang.org/stable/std/primitive.slice.html#method.get_disjoint_unchecked_mut) - [`slice::GetDisjointMutError`] (https://doc.rust-lang.org/stable/std/slice/enum.GetDisjointMutError.html) - [`HashMap::get_disjoint_mut`] (https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.get_disjoint_mut) - [`HashMap::get_disjoint_unchecked_mut`] (https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.get_disjoint_unchecked_mut) - [`NonZero::count_ones`] (https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.count_ones) - [`Vec::pop_if`] (https://doc.rust-lang.org/std/vec/struct.Vec.html#method.pop_if) - [`sync::Once::wait`] (https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.wait) - [`sync::Once::wait_force`] (https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.wait_force) - [`sync::OnceLock::wait`] (https://doc.rust-lang.org/stable/std/sync/struct.OnceLock.html#method.wait) These APIs are now stable in const contexts: - [`hint::black_box`] (https://doc.rust-lang.org/stable/std/hint/fn.black_box.html) - [`io::Cursor::get_mut`] (https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#method.get_mut) - [`io::Cursor::set_position`] (https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#method.set_position) - [`str::is_char_boundary`] (https://doc.rust-lang.org/stable/std/primitive.str.html#method.is_char_boundary) - [`str::split_at`] (https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at) - [`str::split_at_checked`] (https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at_checked) - [`str::split_at_mut`] (https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at_mut) - [`str::split_at_mut_checked`] (https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at_mut_checked) Cargo ----- - [When merging, replace rather than combine configuration keys that refer to a program path and its arguments.] (rust-lang/cargo#15066) - [Error if both `--package` and `--workspace` are passed but the requested package is missing.] (rust-lang/cargo#15071) This was previously silently ignored, which was considered a bug since missing packages should be reported. - [Deprecate the token argument in `cargo login` to avoid shell history leaks.] (rust-lang/cargo#15057) - [Simplify the implementation of `SourceID` comparisons.] (rust-lang/cargo#14980) This may potentially change behavior if the canonicalized URL compares differently in alternative registries. Rustdoc ----- - [Add a sans-serif font setting.] (rust-lang/rust#133636) Compatibility Notes ------------------- - [The `wasm_c_abi` future compatibility warning is now a hard error.] (rust-lang/rust#133951) Users of `wasm-bindgen` should upgrade to at least version 0.2.89, otherwise compilation will fail. - [Remove long-deprecated no-op attributes `#![no_start]` and `#![crate_id]`.] (rust-lang/rust#134300) - [The future incompatibility lint `cenum_impl_drop_cast` has been made into a hard error.] (rust-lang/rust#135964) This means it is now an error to cast a field-less enum to an integer if the enum implements `Drop`. - [SSE2 is now required for "i686" 32-bit x86 hard-float targets; disabling it causes a warning that will become a hard error eventually.] (rust-lang/rust#137037) To compile for pre-SSE2 32-bit x86, use a "i586" target instead. Internal Changes ---------------- These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools. - [Build the rustc on AArch64 Linux with ThinLTO + PGO.] (rust-lang/rust#133807) The ARM 64-bit compiler (AArch64) on Linux is now optimized with ThinLTO and PGO, similar to the optimizations we have already performed for the x86-64 compiler on Linux. This should make it up to 30% faster.

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kadiwa4 force-pushed the uplift_double_negation branch from af85271 to a745a8d Compare June 17, 2024 18:22

nnethercote reviewed Jun 18, 2024

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kadiwa4 force-pushed the uplift_double_negation branch from a745a8d to 8f3387c Compare September 1, 2024 17:25

kadiwa4 changed the title ~~Uplift clippy::double_neg lint as double_negation~~ Uplift clippy::double_neg lint as double_negations Sep 1, 2024

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kadiwa4 force-pushed the uplift_double_negation branch from 8f3387c to 9862f05 Compare September 1, 2024 18:01

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kadiwa4 force-pushed the uplift_double_negation branch from 9862f05 to beb1dd2 Compare October 29, 2024 19:54

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Tracking issue for release notes of #126604: Uplift clippy::double_neg lint as double_negations #135932

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kadiwa4 added 3 commits January 26, 2025 12:15

unrelated cleanup

d810d42

remove clippy::double_neg

9e316f3

implement lint double_negations

c1dcbeb

kadiwa4 force-pushed the uplift_double_negation branch from d3cbf72 to c1dcbeb Compare January 26, 2025 11:18

bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jan 26, 2025

fmease mentioned this pull request Jan 27, 2025

Rollup of 8 pull requests #136116

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bors merged commit 3c58b2f into rust-lang:master Jan 27, 2025
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kadiwa4 deleted the uplift_double_negation branch January 27, 2025 09:43

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cuviper mentioned this pull request Mar 21, 2025

Draft release notes for 1.86.0 #138795

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jieyouxu added A-lints Area: Lints (warnings about flaws in source code) such as unused_mut. L-double_negations Lint: double_negations labels Mar 22, 2025

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Uplift `clippy::double_neg` lint as `double_negations` #126604

Uplift `clippy::double_neg` lint as `double_negations` #126604

kadiwa4 commented Jun 17, 2024 •

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Uplift clippy::double_neg lint as double_negations #126604

Uplift clippy::double_neg lint as double_negations #126604

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Uplift `clippy::double_neg` lint as `double_negations` #126604

Uplift `clippy::double_neg` lint as `double_negations` #126604

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