[Bug c++/87269] [9 Regression] ICE in tsubst_copy, at cp/pt.c:15475 starting from r261802

[nathan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87269

--- Comment #5 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
Martin, this isn't icing now.