Add `duplicate_mod` lint
Inspired by #8827, warns if there's a single file that is loaded by more than one `mod` item
```rust,ignore
// lib.rs
mod a;
mod b;
```
```rust,ignore
// a.rs
#[path = "./b.rs"]
mod b;
```
It adds a `canonicalize` call per `mod file;` encountered, which I don't think should be too heavy
Integration tests with common modules, e.g. [`test_utils`](2038084cf2/tests/test_utils) doesn't trigger it as each test is compiled separately, however I couldn't figure out a good way to add a test for that
changelog: Add [`duplicate_mod`] lint
Fix redundant_allocation warning for Rc<Box<str>>
changelog: [`redundant_allocation`] Fixes#8604
Fixes false positives where a fat pointer with `str` type was made thin by another allocation, but that thinning allocation was marked as redundant
Tweak some words improved representation
Hello! Thank you for this awesome project!
This PR has implemented improved representation.
- Use "lib" instead of "lifb"
- Use "triggered" instead of "triggere"
- Use "blacklisted_name" instead of "blackisted_name"
- Use "stabilization" instead of "stabilisation"
- Use "behavior" instead of "behaviour"
- Use "target" instead of "tartet"
- Use "checked_add" instead of "chcked_add"
- Use "anti-pattern" instead of "antipattern"
- Use "suggestion" instead of "suggesttion"
- Use "example" instead of "exampel"
- Use "Cheat Sheet" instead of "Cheatsheet"
---
changelog: none
This PR has implemented improved representation.
- Use "lib" instead of "lifb"
- Use "triggered" instead of "triggere"
- Use "blacklisted_name" instead of "blackisted_name"
- Use "stabilization" instead of "stabilisation"
- Use "behavior" instead of "behaviour"
- Use "target" instead of "tartet"
- Use "checked_add" instead of "chcked_add"
- Use "anti-pattern" instead of "antipattern"
- Use "suggestion" instead of "suggesttion"
- Use "example" instead of "exampel"
- Use "Cheat Sheet" instead of "Cheatsheet"
Some lintcheck cleanup
A grab bag of smaller changes:
Panics if a crate source isn't valid, and fixes the `ryu` crate entry so it's picked up. Took me a while to realise why I couldn't do `cargo lintcheck --only ryu` 😅
Parses messages with `cargo_metadata`, this catches a few more lints that were ignored because the message had an [expansion field](https://docs.rs/cargo_metadata/latest/cargo_metadata/diagnostic/struct.DiagnosticSpanMacroExpansion.html) that contained a path pointing into `.../.toolchains/...`. It also no longer emits some log lines with `null` as the column
It also merges the `run_clippy_lint` invocations and splits `LintcheckConfig` out into its own file
changelog: none
New lint: [`derive_partial_eq_without_eq`]
Introduces a new lint, [`derive_partial_eq_without_eq`].
See: #1781 (doesn't close it though).
changelog: add lint [`derive_partial_eq_without_eq`]
Replace `#[allow]` with `#[expect]` in Clippy
Hey `@rust-lang/clippy,` `@Alexendoo,` `@dswij,` I'm currently working on the expect attribute as defined in [Rust RFC 2383](https://rust-lang.github.io/rfcs/2383-lint-reasons.html). With that, an `#[allow]` attribute can be replaced with a `#[expect]` attribute that suppresses the lint, but also emits a warning, if the lint isn't emitted in the expected scope.
With this PR I would like to test the attribute on a project scale and Clippy obviously came to mind. This PR replaces (almost) all `#[allow]` attributes in `clippy_utils` and `clippy_lints` with the `#[expect]` attribute. I was also able to remove some allows since, the related FPs have been fixed 🎉.
My question is now, are there any concerns regarding this? It's still okay to add normal `#[allow]` attributes, I see the need to nit-pick about that in new PRs, unless it's actually a FP. Also, I would not recommend using `#[expect]` in tests, as changes to a lint could the trigger the expect attribute in other files.
Additionally, I've noticed that Clippy has a bunch of `#[allow(clippy::too_many_lines)]` attributes. Should we maybe allow the lint all together or increase the threshold setting? To me, it seems like we mostly just ignore it in our code. 😅🙃
---
changelog: none
r? `@flip1995` (I've requested you for now, since you're also helping with reviewing the expect implementation. You are welcome to delegate this PR, even if it should be a simple review 🙃 )
Recommend let chains over if_chain in docs
Switches over bit_mask.rs to let chains in order to create a nice example
While the rustfmt thing isn't resolved yet, my rust-analyzer isn't a fan of large `if_chains!`s, it stops giving me hover info and such after some number of if statements
changelog: none
Optionally allow `expect` and `unwrap` in tests
This addresses #1015, except it makes the new behavior optional.
The reason for the msrv-related changes is as follows.
Rather than expand `check_methods` list of arguments, it seemed easier to make `check_methods` a method of `Methods`, so that `check_methods` could access `Methods`' fields.
`check_methods` had an `msrv` parameter, which I consequently made a field of `Methods`. But, to avoid adding a lifetime parameter to `Methods`, I made the field type `Option<RustcVersion>` instead of the parameter's existing type, `Option<&RustcVersion>`. This seemed sensible since `RustcVersion` implements `Copy`. But this broke a lot of code that expected an `Option<&RustcVersion>` or `&Option<RustcVersion>`. I changed all of those occurrences to `Option<RustcVersion>`. IMHO, the code is better as a result of these changes, though.
The msrv-related changes are in their own commit to (hopefully) ease review.
Closes#1015
changelog: optionally allow `expect` and `unwrap` in tests
r? `@llogiq`
Address `unnecessary_to_owned` false positive
My proposed fix for #8759 is to revise the conditions that delineate `redundant_clone` and `unnecessary_to_owned`:
```rust
// Only flag cases satisfying at least one of the following three conditions:
// * the referent and receiver types are distinct
// * the referent/receiver type is a copyable array
// * the method is `Cow::into_owned`
// This restriction is to ensure there is no overlap between `redundant_clone` and this
// lint. It also avoids the following false positive:
// https://github.com/rust-lang/rust-clippy/issues/8759
// Arrays are a bit of a corner case. Non-copyable arrays are handled by
// `redundant_clone`, but copyable arrays are not.
```
This change causes a few cases that were previously flagged by `unnecessary_to_owned` to no longer be flagged. But one could argue those cases would be better handled by `redundant_clone`.
Closes#8759
changelog: none
Pass through extra args in `cargo dev lint`
changelog: Pass through extra args in `cargo dev lint`
Lets you pass some useful flags through, like `-A/W/etc`, `--fix`, `--force-warn`
Support negative ints in manual_range_contains
fixes: #8721
changelog: Fixes issue where ranges containing ints with different signs would be
incorrect due to comparing as unsigned.
Suggest -Zunpretty=ast-tree instead of -Zast-json
-Zast-json is being removed shortly: https://github.com/rust-lang/rust/pull/85993.
ast-tree does essentially the same thing, and still works today even before that PR lands.
changelog: none
Fix `cast_lossless` to avoid warning on `usize` to `f64` conversion.
Previously, the `cast_lossless` lint would issue a warning on code that
converted a `usize` value to `f64`, on 32-bit targets.
`usize` to `f64` is a lossless cast on 32-bit targets, however there is
no corresponding `f64::from` that takes a `usize`, so `cast_lossless`'s
suggested replacement does not compile.
This PR disables the lint in the case of casting from `usize` or `isize`.
Fixes#3689.
changelog: [`cast_lossless`] no longer gives wrong suggestion on usize,isize->f64
Lint `empty_lint_after_outer_attr` on argumentless macros
Reverts the change from 034c81b761 as it's no longer needed. The test is left just in case. Original issue is #2475.
changelog: Lint `empty_lint_after_outer_attr` on argumentless macros again
Rustup
r? `@ghost`
changelog: move trait_duplication_in_bounds and type_repetition_in_bounds to nursery temporarily. This could already be reverted before the release. Check the Clippy in the Rust repo beta branch when writing this changelog.
Those lints are trait_duplication_in_bounds and
type_repetition_in_bounds. I don't think those can be fixed on the
Clippy side alone, but need changes in the compiler. So let's move them
to nursery to get the sync through and then fix them on the rustc side.
Also adds a regression test that has to be fixed before they can be
moved back to pedantic.
Overhaul `MacArgs`
Motivation:
- Clarify some code that I found hard to understand.
- Eliminate one use of three places where `TokenKind::Interpolated` values are created.
r? `@petrochenkov`
The value in `MacArgs::Eq` is currently represented as a `Token`.
Because of `TokenKind::Interpolated`, `Token` can be either a token or
an arbitrary AST fragment. In practice, a `MacArgs::Eq` starts out as a
literal or macro call AST fragment, and then is later lowered to a
literal token. But this is very non-obvious. `Token` is a much more
general type than what is needed.
This commit restricts things, by introducing a new type `MacArgsEqKind`
that is either an AST expression (pre-lowering) or an AST literal
(post-lowering). The downside is that the code is a bit more verbose in
a few places. The benefit is that makes it much clearer what the
possibilities are (though also shorter in some other places). Also, it
removes one use of `TokenKind::Interpolated`, taking us a step closer to
removing that variant, which will let us make `Token` impl `Copy` and
remove many "handle Interpolated" code paths in the parser.
Things to note:
- Error messages have improved. Messages like this:
```
unexpected token: `"bug" + "found"`
```
now say "unexpected expression", which makes more sense. Although
arbitrary expressions can exist within tokens thanks to
`TokenKind::Interpolated`, that's not obvious to anyone who doesn't
know compiler internals.
- In `parse_mac_args_common`, we no longer need to collect tokens for
the value expression.
