In file included from main.cpp:19:0:
is_customly_convertible.h: In member function 'NoTriviallyConstructible Convert<NoCopyConstructible, NoTriviallyConstructible>::operator()(const int&)':
is_customly_convertible.h:34:17: error: could not convert '{1, 2}' from '<brace-enclosed initializer list>' to 'NoTriviallyConstructible'
     return {1, 2};
                 ^