[Bug c++/63515] Deduced number of parameters can be deduced from unrelated type

[luka.rahne at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63515

--- Comment #3 from Luka Rahne <luka.rahne at gmail dot com> ---
Extra observations:

It looks to me that assignment "auto c = CurriedImpl<2,some_type>(f);" tries to
construct an operator();

If operator() is renamed to function fun or assignment is replaced by
constructor there is no issues.