`proc-macro-en` was removed from crates.io due to malicious code

We identified that `proc-macro-en` contained the same build script as
`proc-macro1` and it was part of the same supply chain attack.

This crate had one single version published at 2026-08-20. The crate was
removed from crates.io and related user account was locked.

This crate was used as part of a malware campaign targeted at users of
`arrayref`, which was downloaded 2,285 times before being removed; see
[the `arrayref` advisory][arrayref-advisory] for more detail.

[arrayref-advisory]: https://rustsec.org/advisories/RUSTSEC-2026-0260.html