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From: "anlauf at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/103367] [10/11/12 Regression] ICE in
 gfc_conv_array_initializer, at fortran/trans-array.c:6377 since
 r12-4278-g74ccca380cde5e79
Date: Tue, 23 Nov 2021 21:20:17 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103367

--- Comment #3 from anlauf at gcc dot gnu.org ---
The 'real' index 'b' is a red herring.  Replacing it e.g. by an undefined '=
m'
generates the same backtrace.

Also replacing the bad code line by

  integer, parameter :: y(1,2) =3D (x(m)%a) ! ICE-on-invalid

reproduces the issue.=