Albab-Hasan da7b8bbec2 fix: detect E0804 when casting raw ptr-to-dyn adds auto traits ...

the `check_ptr_ptr_cast` function had an early return when the source and
destination dyn trait objects shared the same principal trait def id:

    if src_principal == dst_principal {
        return Ok(());
    }

this bypassed all three remaining checks that the code comment explicitly
listed as required: generic argument equality, projection equality, and
the auto-trait superset check. as a result, casts like
`*mut dyn Trait as *mut (dyn Trait + Send)` were silently accepted
instead of emitting E0804.

the fix removes the early return. `CastError::PtrPtrAddingAutoTraits` and
its diagnostic were already implemented — they just couldn't be reached.
the supertrait case (`trait Trait: Send`) continues to work correctly
because the auto-trait check already accounts for implied auto traits via
supertrait elaboration.

2026-02-24 18:59:02 +06:00

..

src

fix: detect E0804 when casting raw ptr-to-dyn adds auto traits

2026-02-24 18:59:02 +06:00

Cargo.toml

rust-analyzer: prep crates for testing against in-tree rustc_private

2025-12-11 20:22:49 +08:00