Build fails on i386: error[E0412]: cannot find type u512 in this scope

[yurivict]

Summary

error[E0412]: cannot find type `u512` in this scope
     --> /wrkdirs/usr/ports/lang/rustpython/work/target/release/build/unicode_names2-fc074b82fe4b3d20/out/generated.rs:13939:43
      |
13939 | pub static PHRASEBOOK_OFFSETS2: &'static [u512] = &[
      |                                           ^^^^ not found in this scope

unicode_names2's last release is 1.2.2, but some other tag is used, which might be a cause of this problem.

log

rust-1.77.0
FreeBSD 13.2

[youknowone]

Rust target used in the log is i686-unknown-freebsd.
I tried to build both unicode_names2 master and RustPython main with the target, RustPython main + unicdoe_names2 1.2.2 with the target, but not reproducible.
How do I reproduce the problem?