Add Centri3 and blyxyas to the reviewer rotation
And with that you will now be picked automatically by rustbot to review pull requests.
Welcome to the team!
Thank you for making Clippy better!
r? `@xFrednet`
changelog: New team members `@Centri3` and `@blyxyas`
Implement rust-lang/compiler-team#578.
When an ICE is encountered on nightly releases, the new rustc panic
handler will also write the contents of the backtrace to disk. If any
`delay_span_bug`s are encountered, their backtrace is also added to the
file. The platform and rustc version will also be collected.
[`manual_filter_map`]: lint on `matches` and pattern matching
Fixes#8010
Previously this lint only worked specifically for a very limited set of methods on the filter call (`.filter(|opt| opt.is_some())` and `.filter(|res| res.is_ok())`). This PR extends it to also recognize `matches!` in the `filter` and pattern matching with `if let` or `match` in the `map`.
Example:
```rs
enum Enum {
A(i32),
B,
}
let _ = [Enum::A(123), Enum::B].into_iter()
.filter(|x| matches!(x, Enum::A(_)))
.map(|x| if let Enum::A(s) = x { s } else { unreachable!() });
```
Now suggests:
```diff
- .filter(|x| matches!(x, Enum::A(_))).map(if let Enum::A(s) = x { s } else { unreachable!() })
+ .filter_map(|x| match x { Enum::A(s) => Some(s), _ => None })
```
Adding this required a somewhat large change in code because it originally seemed to be specifically written with only method calls in the filter in mind, and `matches!` has different behavior in the map, so this new setup should make it possible to support more "generic" cases that need different handling for the filter and map calls.
changelog: [`manual_filter_map`]: lint on `matches` and pattern matching (and some internal refactoring)
Fix `unwrap_or_else_default` false positive
This PR fixes a false positive in the handling of `unwrap_or_else` with a default value when the value is needed for type inference.
An easy example to exhibit the false positive is the following:
```rust
let option = None;
option.unwrap_or_else(Vec::new).push(1);
```
The following code would not compile, because the fact that the value is a `Vec` has been lost:
```rust
let option = None;
option.unwrap_or_default().push(1);
```
The fix is to:
- implement a heuristic to tell whether an expression's type can be determined purely from its subexpressions, and the arguments and locals they use;
- apply the heuristic to `unwrap_or_else`'s receiver.
The heuristic returns false when applied to `option` in the above example, but it returns true when applied to `option` in either of the following examples:
```rust
let option: Option<Vec<u64>> = None;
option.unwrap_or_else(Vec::new).push(1);
```
```rust
let option = None::<Vec<u64>>;
option.unwrap_or_else(Vec::new).push(1);
```
(Aside: https://github.com/rust-lang/rust-clippy/pull/10120 unfairly contained multiple changes in one PR. I am trying to break that PR up into smaller pieces.)
---
changelog: FP: [`unwrap_or_else_default`]: No longer lints if the default value is needed for type inference
Remove `#![allow(unused)]` and `--crate-name` from `cargo dev new_lint` generated tests
changelog: none
Also removes some unused flags from `ui-cargo` tests because the entrypoint is now the `Cargo.toml`, not the `.rs` files
New lint [`iter_skip_zero`]
Idea came from my contribution to `unnecessary_cast` recently. Sorry about that 😅
Could be an issue if somebody manually implements `skip`, but I don't think anybody will (and this would be an issue with other lints too, afaik)
changelog: New lint [`iter_skip_zero`]
New lint [`string_lit_chars_any`]
Closes#10389
This lint can probably be deprecated if/when rustc optimizes `.chars().any(...)`.
changelog: New lint [`string_lit_chars_any`]
Rewrite [`tuple_array_conversions`]
Fixes#11100Fixes#11144Fixes#11124#11082 still needs discussion and #11085 likely can't be fixed.
changelog: [`tuple_array_conversions`]: Move to `pedantic`
changelog: [`tuple_array_conversions`]: Don't lint if mutability of references changes
changelog: [`tuple_array_conversions`]: Don't lint if bindings don't come from the exact same pattern
changelog: [`tuple_array_conversions`]: Don't lint if bindings are used for more than just the conversion
new lint: `format_collect`
A perf lint that looks for `format!`ing inside of `map`, then collecting it into a `String`. Did a quick benchmark locally and it's a bit more than 2x faster with fold.
`write!` is still not optimal (presumably because the fmt stuff goes through dynamic dispatch), but it's still a lot better than creating a new string on every element.
I thought about making a machine applicable suggestion, but there's a lot of suggestions that need to be made here, so I decided to just add help messages.
changelog: new lint: `format_collect`
don't hide lifetimes for `LateContext`
Running `cargo dev new_lint --type methods` creates the lint file with hidden lifetimes for the `LateContext` parameter (i.e. `&LateContext`, when it should be `&LateContext<'_>`). This is already warned on with `#![warn(rust_2018_idioms)]`, so clippy should not use hidden lifetimes
changelog: none
