[Bug c++/57520] alias template substitution/deduction failure

[pei.chunsheng at outlook dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57520

--- Comment #2 from Chunsheng Pei <pei.chunsheng at outlook dot com> ---
Addition to my previous comments

GCC/clang also reports it could not match f1 at this time.