https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63552
janus at gcc dot gnu.org changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |janus at gcc dot gnu.org --- Comment #2 from janus at gcc dot gnu.org --- (In reply to Tobias Burnus from comment #0) > call co_reduce(a,x%tbp) > 1 > Error: Expected argument list at (1) That error comes from 'gfc_match_varspec' (in primary.c). In general I think it's not possible to decide at parse-time whether the TBP should have an argument list here or not (depending on whether the dummy is a procedure, which may not be known while parsing). The error should probably move to resolution stage, where all argument checking is done.