Attached below are the output of runs w/ Guile 1.4.1.124
and 1.8.7, respectively, made by command:

 guile -s string-xrep.scm > string-xrep-VERSION.out

in a ‘LANG=it_IT.UTF-8’ environment.  Could people who run
other Guile versions and/or other environments please run
the program and post the output, too?  Thanks!