syn_rst

  match a.cmp(&b) {
      Ordering::Equal => 0,
      Ordering::Greater => 1,
      Ordering::Less => -1
  }

  fn leak() {
      // Create a 1KiB heap-allocated vector
      let b = Box::new(vec![0u8; 1024]);
      // Turn it into a raw pointer
      let p = Box::into_raw(b);
      // Then leak the pointer
  }

  foo.into_iter().map(|x| x+1)
     .filter(|y| y > 2)