//ww:run-exit 10
// Migrated from 700_e2e row 97.
package main;
import os;
fn main() i32 = {
  let buf: [3]u8;
  buf[0] = 88: u8;
  let ok: (i64 | os.oserror) = os.trywrite(1, buf.ptr, 1u64);
  let bad: (i64 | os.oserror) = os.trywrite(999: i32, buf.ptr, 1u64);
  let acc: i32 = 0;
  match (ok) {
    case let n: i64 => acc += n: i32;
    case let e: os.oserror => acc += -100;
  };
  match (bad) {
    case let n: i64 => acc += -100;
    case let e: os.oserror => acc += (- (e: i64)): i32;
  };
  return acc;
};