Hi Dmitry, Thanks for the report! I fixed it by using memmove as you suggested:
http://git.sv.gnu.org/cgit/guile.git/commit/?id=8071964943e23700cfe1095ba0f5e3c99f590dee Ludo’.
- bug#10070: bytevector-copy! overlapping behavior is not s... Dmitry Chestnykh
- bug#10070: bytevector-copy! overlapping behavior is ... Ludovic Courtès
