> Rust is often somewhat stable, but not always.

> https://internals.rust-lang.org/t/type-inference-breakage-in...

> https://github.com/rust-lang/rust/issues/127343

> 300 comments on Github.

> https://github.com/NixOS/nixpkgs/pull/332176

Might worth noting that this change technically doesn't violate Rust's stability guarantees since type inference changes and/or adding new impls are exempt. Of course, that doesn't really help with the question of whether this change should have been made in the given timeframe (as opposed to the socket struct change IIRC?), but that ship has long sailed.