throw("runtime.SetFinalizer: second argument is " + toRType(ftyp).string() + ", not a function")
	}
	ft := (*functype)(unsafe.Pointer(ftyp))
	if ft.IsVariadic() {
		throw("runtime.SetFinalizer: cannot pass " + toRType(etyp).string() + " to finalizer " + toRType(ftyp).string() + " because dotdotdot")
	}
	if ft.InCount != 1 {
		throw("runtime.SetFinalizer: cannot pass " + toRType(etyp).string() + " to finalizer " + toRType(ftyp).string())
	}