rust_book_code 0.2.1

The code of rust book
Documentation 
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// unit tests
pub fn add_two(a: i32) -> i32 {
    internal_adder(a, 2)
}

fn internal_adder(a: i32, b: i32) -> i32 {
    a + b
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    #[ignore]
    fn internal() {
        assert_eq!(4, internal_adder(2, 2));
    }
}