[Bug libstdc++/79254] [5/6/7 Regression] basic_string::operator= isn't exception safe

[gcc-bugzilla at daryl dot haresign.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79254

--- Comment #6 from Daryl Haresign <gcc-bugzilla at daryl dot haresign.com> ---
I guess you don't want _M_copy_assign to be public, either.