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7c2012d0ec
rust/compiler/rustc_hir_analysis
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bors 7c2012d0ec Auto merge of #121676 - Bryanskiy:polarity, r=petrochenkov 
Support ?Trait bounds in supertraits and dyn Trait under a feature gate

This patch allows `maybe` polarity bounds under a feature gate. The only language change here is that corresponding hard errors are replaced by feature gates. Example:
```rust
#![feature(allow_maybe_polarity)]
...
trait Trait1 : ?Trait { ... } // ok
fn foo(_: Box<(dyn Trait2 + ?Trait)>) {} // ok
fn bar<T: ?Sized + ?Trait>(_: &T) {} // ok
```
Maybe bounds still don't do anything (except for `Sized` trait), however this patch will allow us to [experiment with default auto traits](https://github.com/rust-lang/rust/pull/120706#issuecomment-1934006762).

This is a part of the [MCP: Low level components for async drop](https://github.com/rust-lang/compiler-team/issues/727)
2024-07-26 20:14:16 +00:00
..
src Auto merge of #121676 - Bryanskiy:polarity, r=petrochenkov 2024-07-26 20:14:16 +00:00
Cargo.toml bump itertools to 0.12 2024-03-08 12:34:05 +03:00
messages.ftl Inside eager ty aliases on unresolved assoc tys suggest fully qualifying instead of restricting their self ty 2024-07-23 01:26:24 +02:00
README.md rustc_typeck to rustc_hir_analysis 2022-09-27 10:37:23 +02:00

README.md

For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.