[Bug c++/61566] [4.9/4.10 Regression] ICE in write_unscoped_name

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61566

--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> ---
In fact, it seems to me that something is going wrong with the context: I don't
see why isn't just a PARM_DECL, as happens for a non-template version of foo.
Better if Jason looks into the issue...

This is a slightly more compact testcase:

struct function
{
  template < typename _Functor>
  function (_Functor);
};

struct C
{
  template <typename T>
  void foo (T, function = [] {});
};

void bar ()
{
  C c;
  c.foo (1);
}