Error(s):

source_file.cpp:17:15: error: type 'float' cannot be narrowed to 'int' in initializer list [-Wc++11-narrowing]
    Foo f{ x, y };
              ^
source_file.cpp:17:15: note: override this message by inserting an explicit cast
    Foo f{ x, y };
              ^
              static_cast<int>( )
1 error generated.