[Bug c++/57460] [C++11] Sfinae doesn't respect dependent context

[daniel.kruegler at googlemail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57460

--- Comment #3 from Daniel Krügler <daniel.kruegler at googlemail dot com> ---
I tried to close the issue as INVALID, but it seems that I cannot do that by
myself.