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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/97430] [10/11 Regression] internal compiler error: in
 verify_ctor_sanity, at cp/constexpr.c:3884
Date: Thu, 15 Oct 2020 04:03:38 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97430

--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
This ought to fix it, though it's completely untested:

--- a/gcc/cp/constexpr.c
+++ b/gcc/cp/constexpr.c
@@ -3661,6 +3661,10 @@ cxx_eval_array_reference (const constexpr_ctx *ctx, =
tree
t,
     {
       tree empty_ctor =3D build_constructor (init_list_type_node, NULL);
       val =3D digest_init (elem_type, empty_ctor, tf_warning_or_error);
+      constexpr_ctx new_ctx =3D *ctx;
+      new_ctx.ctor =3D build_constructor (elem_type, NULL);
+      new_ctx.object =3D NULL_TREE;
+      ctx =3D &new_ctx;
     }
   else
     val =3D build_value_init (elem_type, tf_warning_or_error);=