Add a new lint for comparison chains
changelog: Adds a new lint: `comparison_chain`.
`comparison_chain` lints all `if` conditional chains where all the conditions are binary comparisons on the same two operands and will suggest a rewrite with `match`.
Closes#4531.
#4542 remove machine applicable suggestion
This helps #4542 (but does not completely resolve) by removing the machine applicable suggestion (which was incorrect) for that case.
I would have preferred to fix the machine applicable suggestion to handle format strings, but that's a bit beyond my current understanding of the clippy codebase. I'd be happy to give it a try given some guidance.
changelog: only produce machine applicable suggestions on `explicit_write` lint
Changes cast-lossless to a pedantic lint
As discussed in #4528, this moves the cast-lossless lint from `all` to `pedantic`.
I couldn't tell from description alone if it should also be removed from the complexity category, so I left it as part of complexity for now. I didn't see any impact to the tests from this change, but I could be wrong (as this is my first PR).
fixes#4528
changelog: Moves cast-lossless from default to checking only as a `pedantic` lint.
Fix incorrect swap suggestion
Clippy suggests using swap on fields belonging to the same owner causing two mutable borrows of the owner.
Disclosure: This is my first time working with clippy and rusts HIR. I'm very grateful for assistance and suggestions to improve the PR.
fixes#981
changelog: Fix false positive in `manual_swap` lint
New `is_integer_const` to check more const ints
This mostly affects loop checks and the modulo_one lint. Tests were also updated where applicable.
changelog: none
Allow block_in_if_{stmt,expr} in external macro
I found this by running `cargo fix --clippy` on quite a big codebase.
You could refactor this assert to
```rust
let block_expr = _;
assert!(block_expr);
```
but,
1. it doesn't increase the readability IMO
2. That isn't possible in a `debug_assert!`
I'm not sure though, if we should allow this for macros in general or just for external macros.
changelog: Allow `block_in_if_{stmt,expr}` in external macros
Fix missing_const_for_fn false positive
We don't want to lint if the type of the method implements drop.
(constant functions cannot evaluate destructors)
changelog: Fix `missing_const_for_fn` false positive
Fixes#4449
More rustfix tests
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cc #3630
This is probably easier reviewed per-commit.
changelog: none
Split up cmp_owned tests, add run-rustfix
Some of the cmp_owned tests emitted non-machine-applicable suggestions,
so I moved them to `tests/ui/cmp_owned/without_suggestion.rs` and added
`// run-rustfix` to the other half.
changelog: none
cc #3630
Fix unused_unit false positive
changelog: Fix `unused_unit` false positive
For some reason the `expr` of `stmt.node` didn't contain the expansion information, but the `stmt.span` does.
Fixes#4076
Account for trait alias when looking for defid
I hit the crash on the `expect` call when running clippy on rustc libcore.
Hopefully this will fix it.
changelog: none
Some of the cmp_owned tests emitted non-machine-applicable suggestions,
so I moved them to `tests/ui/cmp_owned/without_suggestion.rs` and added
`// run-rustfix` to the other half.
cc #3630
Fix some suggestions for redundant_pattern_matching
.. and change the Applicability to `MaybeIncorrect`.
Fixes the problem displayed in https://github.com/rust-lang/rust-clippy/issues/4344#issuecomment-519206388.
We now append `{}` to the suggestion so that the conditional has the
correct syntax again.
(If we were to _remove_ the `if` instead, it would trigger the
`unused_must_use` warning for `#[must_use]` types.)
changelog: Fix some suggestions for `redundant_pattern_matching`
Fixes the problem displayed in https://github.com/rust-lang/rust-clippy/issues/4344#issuecomment-519206388.
We now append `{}` to the suggestion so that the conditional has the
correct syntax again.
(If we were to _remove_ the `if` instead, it would trigger the
`unused_must_use` warning for `#[must_use]` types.
Add autofixable suggestion for unseparated integer literal suffixes
changelog: Add autofixable suggestion for unseparated integer literal suffixes
Somewhat WIP, since I haven't been able to get this working when adding `// run-rustfix` to `ui/literals.rs`. I think the issue is that there are multiple suggestions operating on one numerical literal, and I'm not sure what the best approach is to work around that.
Thanks
Update lint deprecation for tool lints
changelog: Allow tool lints (`clippy::*`) to be deprecated
Our lint deprecation previously didn't work for tool lints, because
`register_removed` was registering lints to be removed _without_ the
`clippy` prefix.
Fixes#4349
Our lint deprecation previously didn't work for tool lints, because
`register_removed` was registering lints to be removed _without_ the
`clippy` prefix.
new_ret_no_self: allow Self in inner type for impl Trait return types
Check the inner types of associated types of a trait when checking for Self in the return type of a `new` method. This means that the following will no longer warn:
```rust
trait Trait {
type Inner;
}
struct S;
impl S {
fn new() -> impl Trait<Inner = Option<Self>> {
struct TraitImpl;
impl Trait for TraitImpl {
type Inner = Option<S>;
}
TraitImpl
}
}
```
```rust
#![feature(async_await)]
struct Connection;
impl Connection {
async fn new() -> Result<Self, ()> {
Ok(S)
}
}
```
closes#4359
changelog: fix `new_ret_no_self` lint for async `new` functions.
Add run-rustfix for needless_bool lint
This splits up the needless_bool tests into `fixable.rs` and
`simple.rs`. `simple.rs` contains the code that triggers the lint
diagnostic without a suggestion.
changelog: none
cc #3630
This splits up the needless_bool tests into `fixable.rs` and
`simple.rs`. `simple.rs` contains the code that triggers the lint
diagnostic without a suggestion.
Split up cast.rs tests, run-rustfix for unnecessary_cast
This splits up the cast.rs tests and enables rustfix tests for the part
of the `unnecessary_cast` lint that emits `MachineApplicable`
suggestions.
changelog: none
cc #3630
This splits up the cast.rs tests and enables rustfix tests for the part
of the `unnecessary_cast` lint that emits `MachineApplicable`
suggestions.
cc #3630
Add negation to `len_zero` lint to show more explicit message.
Fixes#4304 I have updated the `len_zero` to show the required negation in case of like the below case.
```
fn main() {
let v = vec![1];
if v.len() > 0 {
}
}
```
changelog: Clarify suggestion of `len_zero` lint.
UI Test Cleanup: No wrong_self_convention in methods.rs
These cases are already covered in `tests/ui/wrong_self_convention.rs`.
cc #2038
changelog: none
Don't nudge people towards toilet closures when producing owl results
`.map_err(drop)` should never be linted since sometimes you want to produce `Result<(), ()>` and the alternative is `.map_err(|_| ())`, which can be ugly. We don't seem to, but it's good to specifically test for this.
changelog: none
r? @yaahallo
This lint adds warning if types are redundantly repeated in trait bounds i.e. `T: Copy, T: Clone` instead of `T: Copy + Clone`. This is a late pass trait lint and has necessitated the addition of code to allow hashing of TyKinds without taking into account Span information.
Ignore generated fresh lifetimes in elision check
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fixes#3988
changelog: Ignore generated fresh lifetimes in elision check.
**HELP**: It seems `tests/ui` are compiled under edition 2015, and I don't know how to add tests for this properly.
Here is the test input it had already passed:
```rust
#![feature(async_await)]
#![allow(dead_code)]
async fn sink1<'a>(_: &'a str) {} // lint
async fn sink1_elided(_: &str) {} // ok
async fn one_to_one<'a>(s: &'a str) -> &'a str { s } // lint
async fn one_to_one_elided(s: &str) -> &str { s } // ok
async fn all_to_one<'a>(a: &'a str, _b: &'a str) -> &'a str { a } // ok
// async fn unrelated(_: &str, _: &str) {} // Not allowed in async fn
// #3988
struct Foo;
impl Foo {
pub async fn foo(&mut self) {} // ok
}
// rust-lang/rust#61115
async fn print(s: &str) { // ok
println!("{}", s);
}
fn main() {}
```
Update pulldown-cmark to 0.5.3
Fixes a couple of crashes of which I added one example to our tests.
changelog: Update `pulldown-cmark` to 0.5.3 to fix potential crashes in `doc_markdown` lint
false positives fixes of `implicit_return`
- Handle returning macro statements properly (remove "this error originates in a macro outside of the current crate")
- Handle functions that return never type
- Handle functions that panic but do not return never type
changelog: Fix false positives in `implicit_return` lint pertaining to macros and panics
Implement lint for inherent to_string() method.
Fixes#4247
changelog: Implement two new lints: `inherent_to_string` and `inherent_to_string_shadow_display`
1) Emits a warning if a type implements an inherent method `to_string(&self) -> String`
2) Emits an error if a type implements an inherent method `to_string(&self) -> String` and also implements the `Display` trait
UI Test Cleanup: Split up checked_unwrap tests
Let's slowly bring that ticket closer to the finish line 🐌🏁
This splits up `tests/ui/checked_unwrap.rs` into:
* `tests/ui/checked_unwrap/complex.rs`
* `tests/ui/checked_unwrap/simple.rs`
Based on the naming of the methods in the tests.
changelog: none
cc #2038
This splits up `tests/ui/checked_unwrap.rs` into:
* `tests/ui/checked_unwrap/complex.rs`
* `tests/ui/checked_unwrap/simple.rs`
Based on the naming of the methods in the tests.
cc #2038
Improve cast_ptr_alignment lint
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* print alignment in bytes in the lint message
* ignore ZST left-hand types
Fixes#3797 and #4256
changelog:
* `cast_ptr_alignment`: Print alignment in bytes in the lint message
* `cast_ptr_alignment`: Ignore casting from ZST left-hand types
Avoid reporting string_lit_as_bytes for long strings
Port of @jens1o code ([b76f939][jens1o_commit])
Fixes#1208
[jens1o_commit]: b76f939ac2
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changelog: bugfix for long strings as bytes
This is in preperation for https://github.com/rust-lang/rust/pull/62150
Also allows deprecations in preperations for intrinsics::init being deprecated, which is a planned future step.
lint does not trigger when there is a difference in mutability
lint does not trigger when the method belongs to a trait which is not implemebted directly (Deref)
trivially_copy_pass_by_ref: print size of type and limit in the lint message
changelog: trivially_copy_pass_by_ref: print size of type and limit in the lint message
Fix match_same_arms to fail late
Changes:
- Add a function search_same_list which return a list of matched expressions
- Change the match_same_arms implementation behavior. It will lint each same arms found.
fixes#4096
changelog: none
Implement "Use last" lint
Closes#3673
This lint checks the use of `x.get(x.len() - 1)` and suggests `x.last()` (where `x` is a `Vec`).
There's at least one more thing that needs to happen here. I believe I am correctly checking most of the scenarios and avoiding false positives. However, if different `Vec`s are used for the `x.get` and `y.len`, then it will emit a false positive. In other words, I need to check to make sure the `Vec`s are the same.
Also, a lot of these commits were temporary and not helpful to the project history...am I supposed to squash on merge? If so, how do I do that?
changelog: New lint: `get_last_with_len`
