#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::ops::Index;
enum Nucleotide {
    A,
    C,
    G,
    T,
}
struct NucleotideCount {
    a: usize,
    c: usize,
    g: usize,
    t: usize,
}
impl Index<Nucleotide> for NucleotideCount {
    type Output = usize;
    fn index(&self, nucleotide: Nucleotide) -> &Self::Output {
        match nucleotide {
            Nucleotide::A => &self.a,
            Nucleotide::C => &self.c,
            Nucleotide::G => &self.g,
            Nucleotide::T => &self.t,
        }
    }
}
fn main() {
    let nucleotide_count = NucleotideCount {
        a: 14,
        c: 9,
        g: 10,
        t: 12,
    };
    assert_eq!(nucleotide_count[Nucleotide::A], 14);
    assert_eq!(nucleotide_count[Nucleotide::C], 9);
    assert_eq!(nucleotide_count[Nucleotide::G], 10);
    assert_eq!(nucleotide_count[Nucleotide::T], 12);
}