[Bug libstdc++/109305] Allocator copy in basic_string::operator=

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109305

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
For your reproducer, the allocator is std::allocator<char> which is an empty
class and copying is a no-op. There is no efficiency concern whatsoever.