(CommandList
  children: [
    (C {(echo)} {(SQ <'--- tai64n has the right format'>)})
    (Pipeline
      children: [
        (Subshell
          child: 
            (CommandList
              children: [
                (Sentence child:(C {(echo)} {(ONE)}) terminator:<Op_Semi ';'>)
                (C {(echo)} {(TWO)})
              ]
            )
          spids: [17 28]
        )
        (C {(tai64n)})
        (C {(sed)} {(SQ <'s/[0-9a-f]/x/g'>)})
      ]
      negated: F
    )
    (C {(echo)} {(SQ <'--- tai64nlocal handles non-@ lines correctly'>)})
    (Sentence
      child: 
        (Pipeline
          children: [
            (Subshell
              child: 
                (CommandList
                  children: [
                    (Sentence child:(C {(echo)} {(one)}) terminator:<Op_Semi ';'>)
                    (C {(echo)} {(two)})
                  ]
                )
              spids: [49 60]
            )
            (C {(tai64nlocal)})
          ]
          negated: F
        )
      terminator: <Op_Semi ';'>
    )
    (C {(echo)} {($ VSub_QMark '$?')})
  ]
)