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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/96462] [10/11 Regression] ICE in  tree check: expected
 identifier_node, have bit_not_expr in find_namespace_slot, at
 cp/name-lookup.c:97
Date: Thu, 04 Feb 2021 02:41:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96462

--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Probably can be fixed with just

--- a/gcc/cp/name-lookup.c
+++ b/gcc/cp/name-lookup.c
@@ -5702,6 +5702,13 @@ lookup_using_decl (tree scope, name_lookup &lookup)

   if (TREE_CODE (scope) =3D=3D NAMESPACE_DECL)
     {
+      /* You cannot using-decl a destructor.  */
+      if (TREE_CODE (lookup.name) =3D=3D BIT_NOT_EXPR)
+   {
+     error ("using-declaration cannot name a destructor");
+     return NULL_TREE;
+   }
+
       /* Naming a namespace member.  */
       qualified_namespace_lookup (scope, &lookup);=