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From: "anlauf at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/106771] [OOP] ICE with PACK intrinsic, in
 gfc_conv_expr_descriptor, at fortran/trans-array.c:7328
Date: Mon, 29 Aug 2022 17:38:36 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106771

--- Comment #2 from anlauf at gcc dot gnu.org ---
Playing a little, I found that the issue might be related to the elemental
function isa.

The following dumb replacement

  function isa(this,i)
    class(t), intent(in) :: this
    integer,  intent(in) :: i(:)
    logical              :: isa(size(i))
    integer :: j
    do j =3D 1, size(i)
       if (i(j)>0 .and. i(j)<=3Dmerge(size(this%iloc),0,allocated(this%iloc=
)))
then
          isa(j) =3D this%iloc(i(j))>0
       else
          isa(j) =3D .false.
       end if
    end do
  end function isa

also avoids the ICE.=