fn C.no() // untyped
fn C.y1(int)
fn C.ret() u8

fn main() {
	C.no(1) // allowed
	C.y1()
	C.y1(1) // ok
	C.y1(1, 2)
	C.ret() // ok
	C.ret(1)
	// avoid cgen whilst warning, later above should error
	main()
	C.af() // ok
	C.af(3)
}

[trusted]
fn C.af() int