File: nullify_05.f90

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module nullify_05_type
contains
   subroutine OBJ()
   end subroutine
end module

module nullify_05_mod
   use nullify_05_type
   type PROB_T
       procedure(OBJ), nopass, pointer :: calfun_struct => null()
   end type PROB_T
   procedure(OBJ), pointer :: calfun_ext
end module

program nullify_05
   use nullify_05_mod
   use nullify_05_type
   procedure(OBJ), pointer :: calfun
   type(PROB_T) :: calfun_2
   calfun_2 % calfun_struct => OBJ
   nullify(calfun_2 % calfun_struct)
   calfun => OBJ
   nullify(calfun)
   calfun_ext => OBJ
   nullify(calfun_ext)

   if (associated(calfun)) error stop
   if (associated(calfun_ext)) error stop
end program