Error(s):

source_file.cpp(3): error C2338: oh no it isn't
source_file.cpp(4): note: see reference to function template instantiation 'void f1<T>(void)' being compiled
        with
        [
            T=long
        ]
source_file.cpp(8): note: see reference to function template instantiation 'void f2<long>(void)' being compiled
Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23506 for x64