Feature flag for `const_fn_trait_ref_impls` not required?!

Reproduce

cargo +nightly-2022-09-16 run - Observe that the code does not compile!
cargo +nightly-2022-09-17 run - Observe the code works with the pull request merged but without using the newly added feature gate.

Name		Name	Last commit message	Last commit date
Latest commit History 1 Commit
src		src
.gitignore		.gitignore
Cargo.lock		Cargo.lock
Cargo.toml		Cargo.toml
README.md		README.md
rust-toolchain.toml		rust-toolchain.toml
rustfmt.toml		rustfmt.toml