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Implement `TryFrom<&OsStr>` for `&str` Recently when trying to work with `&OsStr` I was surprised to find this `impl` missing. Since the `to_str` method already existed the actual implementation is fairly non-controversial, except for maybe the choice of the error type. I chose an opaque error here instead of something like `std::str::Utf8Error`, since that would already make a number of assumption about the underlying implementation of `OsStr`. As this is a trait implementation, it is insta-stable, if I'm not mistaken? Either way this will need an FCP. I chose "1.64.0" as the version, since this is unlikely to land before the beta cut-off. `@rustbot` modify labels: +T-libs-api API Change Proposal: rust-lang/rust#99031 (accepted)