test_crate_cargo/
lib.rs

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//! # Test Crate
//! `test_crate_cargo` is a test crate.

/// Adds one to the number given.
///
/// # Examples
///
/// ```
/// let arg = 5;
/// let answer = adder::add_one(arg);
///
/// assert_eq!(6, answer);
/// ```
pub fn add_one(x: i32) -> i32 {
    x + 1
}