[Bug c++/110523] [14 Regression] ICE in redeclare_class_template, at cp/pt.cc:6391 on json-3.11.2

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110523

--- Comment #6 from David Binderman <dcb314 at hotmail dot com> ---
The only C++ related commit in that range is:

commit db38b285ba61c5b888adc0d117177bfd774c1153
Author: Patrick Palka <ppalka@redhat.com>
Date:   Fri Jun 30 15:05:22 2023 -0400

    c++: fix up caching of level lowered ttps