[Bug tree-optimization/105705] [12/13 Regression] std::equal triggers incorrect -Wnonnull warning

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105705

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The warning started to be given without -Wsystem-headers with r12-1992

It was already present with -Wsystem-headers, but suppressed by default.