[Bug fortran/77657] link error with implementation of user-defined derived type input/output (UD-DTIO) in child extending abstract parent

[damian at sourceryinstitute dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77657

--- Comment #2 from Damian Rouson <damian at sourceryinstitute dot org> ---
Bravo!

:D