//ww:run-exit 60
// Migrated from 700_e2e row 16.
package main;
fn main() i32 = {
  let arr: [4]u8;
  arr[0] = 10: u8; arr[1] = 20: u8;
  arr[2] = 30: u8; arr[3] = 99: u8;
  let s: []u8 = arr[0:3];
  let sum: i32 = 0;
  let i: i32 = 0;
  for (i < s.len) { sum += s[i]: i32; i += 1; };
  return sum;
};