https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68440
--- Comment #1 from Gerhard Steinmetz <gerhard.steinmetz.fort...@t-online.de> --- Some variants : $ cat z4.f90 subroutine s type t end type class(t), parameter :: x = t() end $ gfortran -g -O0 -Wall -fcheck=all z4.f90 f951: internal compiler error: Segmentation fault --- $ cat z5.f90 subroutine s type t end type class(t) :: x = t() end $ gfortran -g -O0 -Wall -fcheck=all z5.f90 z5.f90:4:16: class(t) :: x = t() 1 Error: CLASS variable 'x' at (1) must be dummy, allocatable or pointer (null):0: confused by earlier errors, bailing out