Move needless_collect to nursery
*Please write a short comment explaining your change (or "none" for internal only changes)*
changelog: [`needless_collect`]: Move `needless_collect` to nursery (Now allow-by-default)
After chatting with a few folks, it seems like `needless_collect` is giving false positives pretty regularly (https://github.com/rust-lang/rust-clippy/issues?q=is%3Aissue+is%3Aopen+needless_collect). We're big supporters of clippy in Nushell, and it's one of the passes we require for CI, but we've had to disable this particular lint. Perhaps it should be moved to the nursery until it's improved?
(apologies if this isn't the right approach to disabling a lint by default. I tried to follow the idea I saw other PRs doing in the past)
Track where diagnostics were created.
This implements the `-Ztrack-diagnostics` flag, which uses `#[track_caller]` to track where diagnostics are created. It is meant as a debugging tool much like `-Ztreat-err-as-bug`.
For example, the following code...
```rust
struct A;
struct B;
fn main(){
let _: A = B;
}
```
...now emits the following error message:
```
error[E0308]: mismatched types
--> src\main.rs:5:16
|
5 | let _: A = B;
| - ^ expected struct `A`, found struct `B`
| |
| expected due to this
-Ztrack-diagnostics: created at compiler\rustc_infer\src\infer\error_reporting\mod.rs:2275:31
```
Improve `needless_lifetimes`
This PR makes the following improvements to `needless_lifetimes`.
* It fixes the following false negative, where `foo` is flagged but `bar` is not:
```rust
fn foo<'a>(x: &'a u8, y: &'_ u8) {}
fn bar<'a>(x: &'a u8, y: &'_ u8, z: &'_ u8) {}
```
* It flags more cases, generally. Previously, `needless_borrow` required *all* lifetimes to be used only once. With the changes, individual lifetimes are flagged for being used only once, even if not all lifetimes are.
* Finally, it tries to produce more clear error messages.
changelog: fix `needless_lifetimes` false negative involving functions with multiple unnamed lifetimes
changelog: in `needless_lifetimes`, flag individual lifetimes used only once, rather than require all lifetimes to be used only once
changelog: in `needless_lifetimes`, emit "replace with `'_`" warnings only when applicable, and point to a generic argument
Add lint for confusing use of `^` instead of `.pow`
fixes#4205
Adds a lint named [`confusing_xor_and_pow`], it warns the user when `a ^ b` is used as the `.pow()` function, it doesn't warn for Hex, Binary... etc.
---
changelog: New lint: [`confusing_xor_and_pow`]
Warn when `clippy::restriction` is enabled via the command line
Currently it catches `#![warn(clippy::restriction)]`, it'll now catch `-W clippy::restriction` from the CLI. Also tweaks the message slightly
changelog: [`blanket_clippy_restriction_lints`]: Warn when `clippy::restriction` is enabled via the command line
fix `undocumented-unsafe-blocks` false positive
This fixes#9142 by iterating over the parent nodes as long as within a block, expression, statement, local, const or static.
---
changelog: none
Certain types must be enclosed in angle brackets and must have generic
arguments substituted to create a working suggestion. For example, if
`s` has type `&[u8]`, then `|s| s.len()` may be replaced with
`<[u8]>::len`. Previously, Clippy erroneously suggested `[T]::len`.
Ensure new_ret_no_self is not fired if impl Trait<Self> is returned.
Fix#7344: ensure new_ret_no_self is not fired if `impl Trait<Self>` is returned.
changelog: [`new_ret_no_self`]: No longer lints when `impl Trait<Self>` is returned
[`use_self`] fix suggestion when full path to struct was given
Previously the following wrong suggestion was given
```rust
impl Error for std::fmt::Error {
fn custom<T: std::fmt::Display>(_msg: T) -> Self {
- std::fmt::Error // Should lint
+ Self::Error // Should lint
}
}
```
Also remove known problem line related to #4140 since it's been closed, and refactor the lint
changelog: [`use_self`] fix suggestion when full path to struct was given
`question_mark` don't lint on `if let Err` with `else`
cc #9518
AFAICT the only time this would be a valid suggestion is the rather esoteric
```rust
let _ = if let Err(e) = x {
return Err(e);
} else {
// no side effects
x.unwrap()
}
```
which doesn't seem worth checking to me. Please correct me if I'm missing something.
changelog: [`question_mark`] don't lint on `if let Err` with `else`
Previously the following wrong suggestion was given
```rust
impl Error for std::fmt::Error {
fn custom<T: std::fmt::Display>(_msg: T) -> Self {
- std::fmt::Error // Should lint
+ Self::Error // Should lint
}
}
```
Also remove known problem line related to #4140 since it's been closed, and refactor the lint
Update `from_raw_with_void_ptr` to support types other than `Box`
This PR updates the `from_raw_with_void_ptr` lint, which covered
`Box::from_raw`, to also cover the `from_raw` static method of the
`Rc`, `Arc`, `alloc::rc::Weak` and `alloc::sync::Weak` types.
It also improves the description and error messages of this lint.
---
changelog: [`from_raw_with_void_ptr`]: Now works with the `Rc`, `Arc`, `alloc::rc::Weak` and `alloc::sync::Weak` types.
add new lint `seek_to_start_instead_of_rewind `
changelog: `seek_to_start_instead_of_rewind`: new lint to suggest using `rewind` instead of `seek` to start
Resolve#8600
Sometimes type annotations are needed for type inferrence to work,
or because of coercions. We don't know this, and we also don't
want users to possibly repeat the entire pattern.
