use crypto::sha256;
   use encoding::hex;
   use fmt;
   use hash;
   use io;
   use os;
   export fn main() void = {
  const hash = sha256::sha256();
  const file = os::open("main.ha")!;
  defer io::close(file);
  io::copy(&hash, file)!;
  let sum: [sha256::SIZE]u8 = [0...];
  hash::sum(&hash, sum);
  hex::encode(os::stdout, sum)!;
  fmt::println()!;
  const greetings = [
    "Hello, world!",
    "¡Hola Mundo!",
    "Γειά σου Κόσμε!",
    "Привет, мир!",
    "こんにちは世界！",
  ];
  for (let i = 0z; i < len(greetings); i += 1) {
    fmt::println(greetings[i])!;
  };
  let x: *int = alloc(42);
  fmt::printfln(" x: {}", x)!;
  fmt::printfln("*x: {}", *x)!;
  free(x);
  const file = os::open(os::args[1])!;
  defer io::close(file)!;
  let buffer: *[65535]u8 = alloc([0...]);
  defer free(buffer);
  const n = io::read(file, buffer)! as size;
  io::write(os::stdout, buffer[..n])!;
   };
   fn sort(items: []int) void = {
      ...
   };
   @test fn sort() void = {
  let items = [5, 4, 3, 2, 1];
  sort(items);
  for (let i = 1z; i < len(items); i += 1) {
    assert(items[i - 1] <= items[i], "list is unsorted");
  };
   };
[br][br]