I think this is a valid question. C++ provides std::is_same<U, T>, why do Rust users need an external dependency (especially given the fact that the type system

I think this is a valid question. C++ provides std::is_same<U, T>, why do Rust users need an external dependency (especially given the fact that the type system is one of Rust's major strengths)? My best guess, going by a comment in the source code, is that this macro will not be necessary in the future, and therefore makes less sense to put in the standard library: > Until RFC 1977 (public dependencies) is accepted, the situation where multiple different versions of the same crate are present is possible. https://github.com/rust-lang/rfcs/pull/1977 https://github.com/rust-lang/rfcs/pull/1977