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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/104228] [9/10/11/12 Regression] ICE in df_install_ref,
 at df-scan.cc:2294 since r8-3589-g707905d0773e5a8e
Date: Fri, 28 Jan 2022 16:19:00 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104228

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |burnus at gcc dot gnu.org

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
If the testcase is extended to:
program p
   character(:), save, allocatable :: x(:)
   call s1
   call s2
   call s3
   call s4
contains
   subroutine s1
      associate (y1 =3D> x)
         y1 =3D [x]
      end associate
   end
   subroutine s2
      associate (y2 =3D> x)
         y2 =3D [x]
      end associate
   end
   subroutine s3
      associate (y3 =3D> x)
         y3 =3D [x]
      end associate
   end
   subroutine s4
      associate (y4 =3D> x)
         y4 =3D [x]
      end associate
   end
end

then the p program contains just one of those y vars (y4/.y4):
__attribute__((fn spec (". ")))
void p ()
{
  static voidD.27 s4D.4214 (void);
  static voidD.27 s3D.4216 (void);
  static voidD.27 s2D.4218 (void);
  static voidD.27 s1D.4220 (void);
  struct array01_character(kind=3D1) y4D.4244;
  static integer(kind=3D8)D.9 .y4D.4222;
  static struct array01_character(kind=3D1) xD.4255 =3D {.dataD.4250=3D0B};
  bitsizetype D.4401;
  sizetype D.4402;

  D.4401 =3D (bitsizetype) (sizetype) NON_LVALUE_EXPR <.y4D.4222> * 8;
  D.4402 =3D (sizetype) NON_LVALUE_EXPR <.y4D.4222>;
  s1D.4220 ();
  s2D.4218 ();
  s3D.4216 ();
  s4D.4214 ();
}

Now, if that .y4 randomly called based on one of the associate users is just
named character length of the x
array (shouldn't it be called .x ?) of a SAVE var in p, I'd think it should=
 go
to the BLOCK where x is defined and nowhere else, all the nested functions =
(=3D=3D
contained subroutines) should refer to it non-locally and shouldn't have it=
 in
its BLOCK_VARS.=