rust/library at ca222b85ff3e5bd2c1c63f94fbc264e2e19aa874 - rust

mirror of https://github.com/rust-lang/rust.git synced 2026-05-07 17:18:32 +03:00

Files

T

Guillaume Gomez ca222b85ff Rollup merge of #156104 - aobatact:try-as-dyn-unsized, r=oli-obk

Relax `T: Sized` bound on `try_as_dyn` / `try_as_dyn_mut`

`trait_info_of` already returns `None` for unsized types, so allowing `T: ?Sized` is sound and lets callers in generic contexts use these functions without a separate `Sized` bound. For unsized `T`, the function always returns `None`.

Tracking issue: rust-lang/rust#144361

## Motivation

Currently, it is not possible to use `try_as_dyn` as "specialization-like" dispatch in
blanket impls with `?Sized` type.

```rust
// Cannot add ?Sized now.
impl<T: 'static /* + ?Sized */, S: Serializer + 'static> Serialize<S> for T {
    fn serialize(&self, serializer: &mut S) -> Result<S::Ok, S::Error> {
        if let Some(spec) = try_as_dyn::<_, dyn SpecializedSer<S>>(self) {
            spec.specialized_serialize(serializer)
        } else {
            // fall back to compile-time reflection via TypeId
            ...
        }
    }
}
```

2026-05-05 02:50:12 +02:00

alloc

Auto merge of #154095 - joboet:vec_clear_truncate, r=nnethercote

2026-05-04 06:16:32 +00:00

alloctests

slice::join: borrow only once during length calc

2026-04-27 20:32:51 +00:00

backtrace @ 28ec93b503

Update backtrace

2026-01-26 10:57:35 +00:00

compiler-builtins

c-b: Ensure check-cfg is set for all targets