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extern crate add3; pub fn add6(x: i64) -> i64 { add3::add3(add3::add3(x)) } pub fn twice(a: add3::Adder, x: i64) -> i64 { a.add(a.add(x)) } pub fn make_adder() -> add3::Adder { add3::Adder::new() } #[test] fn it_works() { assert_eq!(13_i64, add6(7)); } #[test] fn twice_works() { assert_eq!(twice(make_adder(), 7), 13); }