[Bug libstdc++/118035] [12/13/14/15 Regression] deque bug when inserting an empty iterator interval

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118035

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #4)
> It only started to lose data with my r5-9770-g397c5bf9204cc8

Which was the backport of r6-3240-g5caff414f153f5 from trunk.