https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108663
--- Comment #1 from Steve Kargl <sgk at troutmask dot apl.washington.edu> --- > $ gfortran-13-20221218 -c z1.f90 # missing error > $ > $ gfortran-13-20230115 -c z1.f90 > z1.f90:12:7: > > 12 | use m, only: t, pdtt, s > | 1 > internal compiler error: in check_complete_insertion, at hash-table.h:578 For the record, the entity 'pdtt' is not specified in the module. It is constructed by gfortran in decl.cc(gfc_get_pdt_instance) when parsing a parameterized derived type. The symbol pdtt means PDT type t, and it appears to inserted into the namespace. A likely better name would have been _PDT_t, because the leading underscore means the name cannot conflict with a user's code and gfortran downcases all parsed code so PDT shows that the symbol is artificial.
