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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/98545] [11 Regression] ICE in write_expression, at
 cp/mangle.c:3352
Date: Wed, 13 Jan 2021 20:45:32 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98545

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Candidate fix:

--- a/gcc/cp/mangle.c
+++ b/gcc/cp/mangle.c
@@ -3349,7 +3349,8 @@ write_expression (tree expr)
   else if (dependent_name (expr))
     {
       tree name =3D dependent_name (expr);
-      gcc_assert (!IDENTIFIER_ANY_OP_P (name));
+      if (IDENTIFIER_ANY_OP_P (name))
+   write_string ("on");
       write_unqualified_id (name);
     }
   else

but I need to figure out how to test this.=