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Rollup merge of #141811 - mejrs:bye_locals, r=compiler-errors 

Unimplement unsized_locals

Implements https://github.com/rust-lang/compiler-team/issues/630

Tracking issue here: https://github.com/rust-lang/rust/issues/111942

Note that this just removes the feature, not the implementation, and does not touch `unsized_fn_params`. This is because it is required to support `Box<dyn FnOnce()>: FnOnce()`.

There may be more that should be removed (possibly in follow up prs)
- the `forget_unsized` function and `forget` intrinsic.
- the `unsized_locals` test directory; I've just fixed up the tests for now
- various codegen support for unsized values and allocas

cc ``@JakobDegen`` ``@oli-obk`` ``@Noratrieb`` ``@programmerjake`` ``@bjorn3``

``@rustbot`` label F-unsized_locals

Fixes rust-lang/rust#79409
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Matthias Krüger 2025-06-14 11:27:10 +02:00 committed by GitHub
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src/implementing_new_features.md
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@ -156,8 +156,8 @@ a new unstable feature:
[`incomplete_features` lint]: https://doc.rust-lang.org/rustc/lints/listing/warn-by-default.html#incomplete-features [`incomplete_features` lint]: https://doc.rust-lang.org/rustc/lints/listing/warn-by-default.html#incomplete-features
```rust ignore ```rust ignore
/// Allows unsized rvalues at arguments and parameters. /// Allows deref patterns.
(incomplete, unsized_locals, "CURRENT_RUSTC_VERSION", Some(48055), None), (incomplete, deref_patterns, "CURRENT_RUSTC_VERSION", Some(87121), None),
``` ```
To avoid [semantic merge conflicts], please use `CURRENT_RUSTC_VERSION` instead of `1.70` or To avoid [semantic merge conflicts], please use `CURRENT_RUSTC_VERSION` instead of `1.70` or