pkg/59382: Rust can't compile/install cargo-watch on a recent SmartOS system

[netbsd%puptv.com@localhost]

>Number:         59382
>Category:       pkg
>Synopsis:       Rust can't compile/install cargo-watch on a recent SmartOS system
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri May 02 14:05:00 +0000 2025
>Originator:     D
>Release:        pkg_install-20241101
>Organization:
SolOS
>Environment:
SunOS tools.local 5.11 joyent_20250417T003816Z i86pc i386 i86pc
>Description:
Can't compile/install cargo-watch on a recent SmartOS system:

error[E0308]: mismatched types
   --> /root/.cargo/registry/src/index.crates.io-6f17d22bba15001f/zbus-5.5.0/src/connection/socket/unix.rs:329:47
    |
329 | fn get_unix_peer_creds_blocking(fd: RawFd) -> io::Result<crate::fdo::ConnectionCredentials> {
    |    ----------------------------               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `Result<ConnectionCredentials, Error>`, found `()`
    |    |
    |    implicitly returns `()` as its body has no tail or `return` expression
    |
    = note:   expected enum `std::result::Result<ConnectionCredentials, std::io::Error>`
            found unit type `()`

>How-To-Repeat:
cargo install cargo-watch
>Fix: