As seen in: - [src/test/run-pass/traits/trait-alias-bounds.rs](https://github.com/rust-lang/rust/blob/ddd4b194a0c28065a277c1f964aa931cc021b5c6/src/test/run-pass/traits/trait-alias-bounds.rs) - [src/test/run-pass/traits/trait-alias-object-type.rs](https://github.com/rust-lang/rust/blob/ddd4b194a0c28065a277c1f964aa931cc021b5c6/src/test/run-pass/traits/trait-alias-object-type.rs) - [src/test/run-pass/traits/trait-alias-syntax.rs](https://github.com/rust-lang/rust/blob/ddd4b194a0c28065a277c1f964aa931cc021b5c6/src/test/run-pass/traits/trait-alias-syntax.rs) Added to rustc in https://github.com/rust-lang/rust/pull/55101.
As seen in:
Added to rustc in rust-lang/rust#55101.