[Bug libstdc++/104559] vector v; v.insert(v.begin()); compiles, but it shouldn't

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104559

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yep, that's why we have it, thanks. But it should have been excised years ago.

I'll deprecate it, and kill it some time after GCC 12.