(CommandList
  children: [
    (AndOr
      ops: [Op_DPipe]
      children: [
        (C {(git)} {(diff-index)} {(--quiet)} {(--cached)} {(HEAD)} {(--)})
        (ControlFlow token:<ControlFlow_Exit exit> arg_word:{(2)})
      ]
    )
    (ControlFlow token:<ControlFlow_Exit exit> arg_word:{(0)})
  ]
)