https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96320
--- Comment #3 from Dominique d'Humieres <dominiq at lps dot ens.fr> --- > Fortran 2008 added module subroutine interface bodies specifically to allow > interface bodies in the same scope a the corresponding procedure definitions. > In order to avoid duplication, the standard also allows the procedure > definition > to begin with "module procedure" and then to omit all arguments. That's what > is > done in the submitted code. The code is accepted by the NAG and Intel > compilers. Do you mean this is F2008 extension?