improve [`match_same_arms`] messages, enable rustfix test
closes: #9251
don't worry about the commit size, most of them are generated
---
changelog: improve [`match_same_arms`] lint messages
`significant_drop_in_scrutinee`: Fix false positives due to false drops of place expressions
Place expressions do not really create temporaries, so they will not create significant drops. For example, the following code snippet is quite good (#8963):
```rust
fn main() {
let x = std::sync::Mutex::new(vec![1, 2, 3]);
let x_guard = x.lock().unwrap();
match x_guard[0] {
1 => println!("1!"),
x => println!("{x}"),
}
drop(x_guard); // Some "usage"
}
```
Also, the previous logic thinks that references like `&MutexGuard<_>`/`Ref<'_, MutexGuard<'_, _>>` have significant drops, which is simply not true, so it is fixed together in this PR.
Fixes https://github.com/rust-lang/rust-clippy/issues/8963
Fixes https://github.com/rust-lang/rust-clippy/issues/9072
changelog: [`significant_drop_in_scrutinee`]: Fix false positives due to false drops of place expressions.
r? `@blyxyas`
new lint: `macro_metavars_in_unsafe`
This implements a lint that I've been meaning to write for a while: a macro with an `expr` metavariable that is then expanded in an unsafe context. It's bad because it lets the user write unsafe code without an unsafe block.
Note: this has gone through some major rewrites, so any comment before https://github.com/rust-lang/rust-clippy/pull/12107#issuecomment-2029503545 is outdated and was based on an older version that has since been completely rewritten.
changelog: new lint: [`macro_metavars_in_unsafe`]
add new lint that disallow renaming parameters in trait functions
fixes: #11443fixes: #486
changelog: add new lint [`renamed_function_params`]
Note that the lint name is not final, because I have a bad reputation in naming things, and I don't trust myself.
Lint direct priority conflicts in `[workspace.lints]`
Partially addresses #12729
This still doesn't do any workspace resolution stuff, so it will not catch any virtual workspaces or conflicts from inherited definitions. But while we're parsing the `Cargo.toml` we might as well check the workspace definitions if we find them
changelog: none
Handle `rustc_on_unimplemented` in duplicated_attributes
```rust
#[rustc_on_unimplemented(
on(
_Self = "&str",
label = "`a"
),
on(
_Self = "alloc::string::String",
label = "a"
),
)]
```
The lint treats this as a repetition because `rustc_on_unimplemented:🔛:label` appears twice, but that's ok.
Fixes#12619
changelog: [`duplicated_attributes`]: fix handling of `rustc_on_unimplemented`
Add new lint `doc_lazy_continuation`
changelog: [`doc_lazy_continuation`]: add lint that warns on so-called "lazy paragraph continuations"
This is a follow-up for https://github.com/rust-lang/rust/pull/121659, since most cases of unintended block quotes are lazy continuations. The lint is designed to be more generally useful than that, though, because it will also catch unintended list items and unintended block quotes that didn't coincidentally hit a pulldown-cmark bug.
The second commit is the result of running `cargo dev dogfood --fix`, and manually fixing anything that seems wrong. NOTE: this lint's suggestions should never change the parser's interpretation of the markdown, but in many cases, it seems that doc comments in clippy were written without regard for this feature of Markdown (which, I suppose, is why this lint should exist).
Ignore `_to_string` lints in code `from_expansion`
Includes the `string_to_string` and `str_to_string` lints.
changelog: [`str_to_string`]: Ignore code from expansion
changelog: [`string_to_string`]: Ignore code from expansion
fix: use hir_with_context to produce correct snippets for assigning_clones
The `assigning_clones` lint is producing wrong output when the assignment is a macro call.
Since Applicability level `Unspecified` will never be changed inside `hir_with_applicability`, so it is safe here to replace `hir_with_applicability` with `hir_with_context` to generate snippets of the macro call instead of the expansion.
fixes#12776
changelog: [`assigning_clones`]: use `hir_with_context` to produce correct snippets
fix false positive in Issue/12098 because lack of consideration of mutable caller
fixes [Issue#12098](https://github.com/rust-lang/rust-clippy/issues/12098)
In issue#12098, the former code doesn't consider the caller for clone is mutable, and suggests to delete clone function.
In this change, we first get the inner caller requests for clone,
and if it's immutable, the following code will suggest deleting clone.
If it's mutable, the loop will check whether a borrow check violation exists,
if exists, the lint should not execute, and the function will directly return;
otherwise, the following code will handle this.
changelog: [`clippy::unnecessary_to_owned`]: fix false positive
Fix website dash replacement
Fixes: #12718
changelog: Made clippy lints website search replace all occurrences of dashes with underscores instead of only the first one. This is in order to allow the user to search for lints with more than two words using dahses.
fix: merge multiple suggestions into a single multi-span suggestion in `needless_late_init`
See https://github.com/rust-lang/rust-analyzer/issues/17163#issuecomment-2097840922.
Currently, the fix for `needless_late_init` would modify multiple parts in the file. However, these modifications are exported as separate suggestions instead of a unified 'multi-part suggestion'.
Consequently, rust-analyzer is unable to perform the fix correctly when applying suggestions automatically, as only one suggestion is processed at a time. This PR addresses this issue by merge all modifications into a single multi-part suggestion.
changelog: [`needless_late_init`]: merge multiple fixes into a single multi-span fix.
This is a follow-up for https://github.com/rust-lang/rust/pull/121659,
since most cases of unintended block quotes are lazy continuations.
The lint is designed to be more generally useful than that, though,
because it will also catch unintended list items and unintended
block quotes that didn't coincidentally hit a pulldown-cmark bug.
Allow more attributes in `clippy::useless_attribute`
Fixes#12753Fixes#4467Fixes#11595Fixes#10878
changelog: [`useless_attribute`]: Attributes allowed on `use` items now include `ambiguous_glob_exports`, `hidden_glob_reexports`, `dead_code`, `unused_braces`, and `clippy::disallowed_types`.
Type safe CLI implementation for clippy-dev
Use the derive feature of `clap` to generate CLI of clippy-dev. Adding new commands will be easier in the future and we get better compile time checking through exhaustive matching.
---
I think I tested everything locally. But I would appreciate if the reviewer could go over it again, so that everything keeps working.
changelog: none
Use the derive feature of `clap` to generate CLI of clippy-dev. Adding new
commands will be easier in the future and we get better compile time checking
through exhaustive matching.
Fix `FormatArgs` storage when `-Zthreads` > 1
Fixes#11886
The initial way I thought of was a little gross so I never opened a PR for it, I thought of a nicer way today that no longer involves any `thread_local`s or `static`s
`rustc_data_strucutres::sync::{Lrc, OnceLock}` implement `DynSend` + `DynSync` so we can pass them to the lint passes that need the storage
changelog: none
r? `@flip1995`
`assigning_clones`: add empty line to doc
changelog: none
This PR adds, for consistency reasons, an empty line to the example in the doc of the `assigning_clones` lint.
Suggest collapsing nested or patterns if the MSRV allows it
Nested `or` patterns have been stable since 1.53, so we should be able to suggest `Some(1 | 2)` if the MSRV isn't set below that.
This change adds an msrv check and also moves it to `matches/mod.rs`, because it's also needed by `redundant_guards`.
changelog: [`collapsible_match`]: suggest collapsing nested or patterns if the MSRV allows it
