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From: "anlauf at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/105243] ICE in next_char, at fortran/io.cc:160
Date: Tue, 17 May 2022 19:56:18 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105243

--- Comment #7 from anlauf at gcc dot gnu.org ---
(In reply to Steve Kargl from comment #6)
> > I quoted the F2018 standard constraint.
> >=20
> > C708 An entity declared with the CLASS keyword shall be a dummy
> >      argument or have the ALLOCATABLE or POINTER attribute.
> >=20
> > class(t), parameter :: y
> >=20
> > would seem to be missing all of the three listed attributes.

You're right here.

> I'll also add=20
>=20
>   7.3.2.3 CLASS type specifier
>=20
>   The CLASS type specifier is used to declare polymorphic entities.
>   A polymorphic entity is a data entity that is able to be of differing
>   dynamic types during program execution.
>=20
> Does is make sense to given a named constant the polymorphic property?

Well, I could imagine named constants that do not have a type (e.g. when
using CLASS(*)), as well as named constants that refer to an extensible
type.  The F2023 draft even has CLASSOF.  Where will this finally lead...

I think I should ask the Intel people why their compiler accepts

program p
  type t
     integer :: i =3D 1
  end type t
  type(t),  parameter :: a =3D t() ! Legal
  class(t), parameter :: b =3D t() ! Likely not
  class(*), parameter :: c =3D t() ! ...
  class(*), parameter :: d =3D 1   ! ...
end=