[Bug libstdc++/68880] [4.9 Regression][Bisected to r202992] std::operator< overload ignored when using std::lower_bound

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68880

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |trippels at gcc dot gnu.org
         Resolution|---                         |INVALID

--- Comment #2 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Yes, this invokes undefined behavior.
See:  http://en.cppreference.com/w/cpp/language/extending_std