[Bug c++/69736] [4.9/5/6 Regression] "error: too few arguments to function" in c++14 but not c++11

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69736

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(fn1)();
is no longer the same as fn1();
But rather it returns an rvalue reference.  So it no longer includes the
default arguments as part of the type.  That is function types don't have
default arguments.