Re: how to investigate "Attempt to reload Readonly/XS.pm aborted"

[Reini Urban]

This has nothing to do with perl-xs, you'd need to read the module
documentation first.
perldoc Readonly
perldoc Readonly::XS

perl -MReadonly::XS -e0
Readonly::XS is not a standalone module. You should not use it
directly. at Readonly/XS.pm line 34.