(CommandList
  children: [
    (C {(echo)} {(SQ <'--- softlimit insists on an argument'>)})
    (Sentence child:(C {(softlimit)}) terminator:<Op_Semi ';'>)
    (C {(echo)} {($ VSub_QMark '$?')})
    (C {(echo)} {(SQ <'--- softlimit complains if it cannot run program'>)})
    (Sentence child:(C {(softlimit)} {(./nonexistent)}) terminator:<Op_Semi ';'>)
    (C {(echo)} {($ VSub_QMark '$?')})
    (C {(echo)} {(SQ <'--- softlimit -p0 still allows exec'>)})
    (Sentence child:(C {(softlimit)} {(-p0)} {(echo)} {(./nonexistent)}) terminator:<Op_Semi ';'>)
    (C {(echo)} {($ VSub_QMark '$?')})
  ]
)