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//! # My Crate //! //! `my_crate` is a collection of utilities to make performing certain //! calculations more convenient. /// Adds one to the number given. /// /// # Examples /// /// ``` /// let mut x = 5; /// my_lib::add_one(&mut x); /// /// assert_eq!(x, 6); /// ``` pub fn add_one(x: &mut i32) { *x += 1; } #[cfg(test)] mod tests { use crate::add_one; #[test] fn it_works() { let mut x = 2; add_one(&mut x); assert_eq!(x, 3); } }