[Bug libstdc++/107778] handle_contract_violation should reflect _GLIBCXX_VERBOSE

[unlvsur at live dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107778

--- Comment #2 from cqwrteur <unlvsur at live dot com> ---
BTW. Why does the default contract does not crash program when it violates?