(CommandList
  children: [
    (Assignment
      keyword: Assign_None
      pairs: [(assign_pair lhs:(LhsName name:width) op:Equal rhs:{(72)} spids:[10])]
      spids: [10]
    )
    (If
      arms: [
        (if_arm
          cond: [
            (Sentence
              child: 
                (C {(Lit_Other '[')} {(KW_Bang '!')} {(-r)} {(DQ ($ VSub_Number '$1'))} {(Lit_Other ']')})
              terminator: <Op_Semi ';'>
            )
          ]
          action: [
            (SimpleCommand
              words: [{(echo)} {(DQ ('Cannot read file ') ($ VSub_Number '$1'))}]
              redirects: [(Redir op:<Redir_GreatAnd '>&'> fd:16777215 arg_word:{(2)})]
            )
            (Sentence
              child: 
                (SimpleCommand
                  words: [{(echo)} {(DQ ('Usage: ') ($ VSub_Number '$0') (' filename'))}]
                  redirects: [(Redir op:<Redir_GreatAnd '>&'> fd:16777215 arg_word:{(2)})]
                )
              terminator: <Op_Semi ';'>
            )
            (ControlFlow token:<ControlFlow_Exit exit> arg_word:{(1)})
          ]
          spids: [16777215 30]
        )
      ]
      spids: [16777215 60]
    )
    (WhileUntil
      keyword: <KW_While while>
      cond: [(C {(read)} {(input)})]
      body: 
        (DoGroup
          children: [
            (If
              arms: [
                (if_arm
                  cond: [
                    (Sentence
                      child: 
                        (C {(Lit_Other '[')} 
                          {
                            (BracedVarSub
                              token: <VSub_Name input>
                              prefix_op: VSub_Pound
                              spids: [76 79]
                            )
                          } {(-gt)} {($ VSub_Name '$width')} {(Lit_Other ']')}
                        )
                      terminator: <Op_Semi ';'>
                    )
                  ]
                  action: [
                    (Pipeline
                      children: [(C {(echo)} {(DQ ($ VSub_Name '$input'))}) (C {(fmt)})]
                      negated: F
                    )
                  ]
                  spids: [16777215 89]
                )
              ]
              else_action: [(C {(echo)} {(DQ ($ VSub_Name '$input'))})]
              spids: [104 114]
            )
          ]
          spids: [69 116]
        )
      redirects: [(Redir op:<Redir_Less '<'> fd:16777215 arg_word:{($ VSub_Number '$1')})]
    )
    (ControlFlow token:<ControlFlow_Exit exit> arg_word:{(0)})
  ]
)