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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/103138] [12 Regression] ICE in gfc_simplify_cshift, at
 fortran/simplify.c:2139
Date: Mon, 08 Nov 2021 22:17:52 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103138

--- Comment #2 from anlauf at gcc dot gnu.org ---
There are more testcases also with valid code which would ICE when using
CLASS and PARAMETER, or are rejected.  See also pr103137.

Another one:

program p
  type t
  end type
  class(t), parameter :: a(2) =3D t()
  integer,  parameter :: c(1) =3D shape (a)
end

The resulting ICE can be fixed,

--- a/gcc/fortran/check.c
+++ b/gcc/fortran/check.c
@@ -5096,6 +5106,9 @@ gfc_check_shape (gfc_expr *source, gfc_expr *kind)
   if (source->rank =3D=3D 0 || source->expr_type !=3D EXPR_VARIABLE)
     return true;

+  if (source->ref =3D=3D NULL)
+    return false;
+
   ar =3D gfc_find_array_ref (source);

   if (ar->as && ar->as->type =3D=3D AS_ASSUMED_SIZE && ar->type =3D=3D AR_=
FULL)

but this gives a bogus error message.=