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pub mod kitties { pub struct cat { meows : usize, pub how_hungry : isize, } impl cat { pub fn speak(&mut self) { self.meows += 1; } pub fn meow_count(&mut self) -> usize { self.meows } } pub fn cat(in_x : usize, in_y : isize) -> cat { cat { meows: in_x, how_hungry: in_y } } }