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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); }