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#[macro_use]
extern crate arrayref;
fn add_three(a: &[u8; 3]) -> u8 {
a[0] + a[1] + a[2]
}
fn main() {
let mut x = [0u8; 30];
x[20] = 1;
x[21] = 4;
x[24] = 3;
x[0] = add_three(array_mut_ref![x,20,3]);
assert_eq!(x[0], 8);
}