The author of proc-macro-error2 has confirmed that the crate is no longer maintained and recommends that users migrate away from it.

proc-macro-error2 was originally created as a maintained fork of proc-macro-error (see RUSTSEC-2024-0370). Both the original crate and this fork are now unmaintained.

Possible Alternative(s)

• manyhow
• proc-macro2-diagnostics