As of RUSTSEC-2026-0173, proc-macro-error2 has been declared unmaintained and its repository has been archived.
The RUSTSEC advisory lists manyhow and proc-macro2-diagnostics as alternatives, but both require rewriting how errors are reported in your proc macros. proc-macro-error3 is a maintained fork and drop-in replacement - same API, no code changes beyond the dependency rename, so the switch is minimal and low-risk.
I maintain proc-macro-error3 and use it in my projects, mainly https://github.com/gungraun/gungraun. Would you be open to this switch? I'm happy to submit a PR if that would help.
As of RUSTSEC-2026-0173,
proc-macro-error2has been declared unmaintained and its repository has been archived.The RUSTSEC advisory lists
manyhowandproc-macro2-diagnosticsas alternatives, but both require rewriting how errors are reported in your proc macros.proc-macro-error3is a maintained fork and drop-in replacement - same API, no code changes beyond the dependency rename, so the switch is minimal and low-risk.I maintain
proc-macro-error3and use it in my projects, mainly https://github.com/gungraun/gungraun. Would you be open to this switch? I'm happy to submit a PR if that would help.