//ww:run-exit 40
// Migrated from 700_e2e row 125.
package main;
import bytes;
fn main() i32 = {
  let buf: [4]u8;
  buf[0] = 1u8; buf[1] = 2u8; buf[2] = 3u8; buf[3] = 4u8;
  let needle: [2]u8;
  needle[0] = 3u8; needle[1] = 4u8;
  let r1: (i32 | void) = bytes.index(buf[0:4], 3u8);
  let r2: (i32 | void) = bytes.index(buf[0:4], needle[0:2]);
  let a: i32 = 99;
  let b: i32 = 99;
  match (r1) {
    case let i: i32 => a = i;
    case void => a = -1;
  };
  match (r2) {
    case let i: i32 => b = i;
    case void => b = -1;
  };
  return a * 10 + b + 18;
};