[Bug c++/88699] [9 Regression] tree check fail: expected function_decl, have using_decl in add_method, at cp/class.c:1137

[dmalcolm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88699

--- Comment #6 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
(In reply to David Malcolm from comment #5)
[...]
> This patch stops the crash for comment #4 (though maybe it's papering over
> the problem):
[...]

It also fixes the ICE from the original reproducer.