[Bug c++/57739] Weaker diagnostics of failed overload resolution when operators are declared as friends instead of externally

[unmobile at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57739

--- Comment #2 from Phil Miller <unmobile at gmail dot com> ---
I've observed the same behavior as far back as g++ 4.4.3, modulo differences in
column number and caret display.