class cat { priv { let mut meows : uint; } let how_hungry : int; new(in_x : uint, in_y : int) { meows = in_x; how_hungry = in_y; } } fn main() { let nyan : cat = cat(52u, 99); let kitty = cat(1000u, 2); assert(nyan.how_hungry == 99); assert(kitty.how_hungry == 2); }