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+```toml
+[advisory]
+id = "RUSTSEC-0000-0000"
+package = "proc-macro-error"
+date = "2024-09-01"
+informational = "unmaintained"
+url = "https://gitlab.com/CreepySkeleton/proc-macro-error/-/issues/20"
+
+[versions]
+patched = []
+```
+
+# proc-macro-error is unmaintained
+
+proc-macro-error's maintainer seems to be unreachable, with no commits for 2 years, no releases pushed for 4 years, and no activity on the GitLab repo or response to email.
+
+proc-macro-error also depends on `syn 1.x`, which may be bringing duplicate dependencies into dependant build trees.
+
+## Possible Alternative(s)
+
+- [proc-macro-error2](https://crates.io/crates/proc-macro-error2)