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Rollup merge of #137728 - Darksonn:no-tuple-unsize, r=oli-obk

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Remove unsizing coercions for tuples

See https://github.com/rust-lang/rust/issues/42877#issuecomment-2686010847 and below comments for justification.

Tracking issue: #42877
Fixes: #135217
This commit is contained in:
许杰友 Jieyou Xu (Joe) 2025-03-05 21:46:44 +08:00 committed by GitHub
commit 905ddf8cd8
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34
crates/ide-db/src/generated/lints.rs
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@ -12311,40 +12311,6 @@ fn main() {
```
will unnecessarily extend the stack frame.
"##,
default_severity: Severity::Allow,
warn_since: None,
deny_since: None,
},
Lint {
label: "unsized_tuple_coercion",
description: r##"# `unsized_tuple_coercion`
The tracking issue for this feature is: [#42877]
[#42877]: https://github.com/rust-lang/rust/issues/42877
------------------------
This is a part of [RFC0401]. According to the RFC, there should be an implementation like this:
```rust,ignore (partial-example)
impl<..., T, U: ?Sized> Unsized<(..., U)> for (..., T) where T: Unsized<U> {}
```
This implementation is currently gated behind `#[feature(unsized_tuple_coercion)]` to avoid insta-stability. Therefore you can use it like this:
```rust
#![feature(unsized_tuple_coercion)]
fn main() {
let x : ([i32; 3], [i32; 3]) = ([1, 2, 3], [4, 5, 6]);
let y : &([i32; 3], [i32]) = &x;
assert_eq!(y.1[0], 4);
}
```
[RFC0401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
"##,
default_severity: Severity::Allow,
warn_since: None,