Macro for_range

macro_rules! for_range {
    ($pat:pat_param in $range:expr => $($code:tt)*) => { ... };
}

For loop over a range

Example

use konst::for_range;
 
const LEN: usize = 10;
const ARR: [u32; LEN] = {
    let mut ret = [1; LEN];
    for_range!{i in 2..LEN =>
        ret[i] = ret[i - 1] + ret[i - 2];
    }
    ret
};
 
assert_eq!(ARR, [1, 1, 2, 3, 5, 8, 13, 21, 34, 55]);