pub fn check_bounds(i: usize, len: usize)
境界チェックを行う。
use nekolib::utils::check_bounds; let a = [0, 1, 2]; check_bounds(2, a.len());
use nekolib::utils::check_bounds; let a = [0, 1, 2]; // panicked at 'index out of bounds: the len is 3 but the index is 3' check_bounds(3, a.len());