
Format extensions
  $ refmt ./input.re
  /* Extension with pexp_apply */
  
  [%defer cleanup()];
  
  /* Extension with comment with pexp_apply */
  
  [%defer
    /* 2. comment attached to expr in extension */
    cleanup()
  ];
  
  /* Let sequence + extension with pexp_apply */
  
  let () = {
    /* random let binding */
    let x = 1;
    /* 1. comment attached to extension */
    [%defer cleanup()];
    /* 3. comment attached to next expr */
    something_else();
  };
  
  /* Let sequence + extension with comment with pexp_apply */
  
  let () = {
    /* random let binding */
    let x = 1;
    /* 1. comment attached to extension */
    [%defer
     /* 2. comment attached to expr in extension */
     cleanup()
    ];
    /* 3. comment attached to next expr */
    something_else();
  };
