(command.CommandList
  children: [
    (command.ShAssignment
      left: <Id.Lit_VarLike 'last_testcase='>
      pairs: [
        (AssignPair
          left: <Id.Lit_VarLike 'last_testcase='>
          lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'last_testcase='> name:last_testcase)
          op: assign_op.Equal
          rhs: {<16>}
        )
      ]
      redirects: []
    )
    (command.Simple
      blame_tok: <echo>
      more_env: []
      words: [{<echo>} {(DQ <1..> ($ Id.VSub_DollarName last_testcase))}]
      redirects: []
      do_fork: T
    )
    (command.ForEach
      keyword: <Id.KW_For for>
      iter_names: [n]
      iterable: 
        (for_iter.Words
          words: [
            {
              (CommandSub
                left_token: <Id.Left_Backtick '`'>
                child: 
                  (command.Simple
                    blame_tok: <seq>
                    more_env: []
                    words: [{<seq>} {<1>} {($ Id.VSub_DollarName last_testcase)}]
                    redirects: []
                    do_fork: T
                  )
                right: <Id.Backtick_Right '`'>
              )
            }
          ]
        )
      semi_tok: <Id.Op_Semi _>
      body: 
        (command.DoGroup
          left: <Id.KW_Do do>
          children: [
            (command.ShAssignment
              left: <Id.Lit_VarLike 'todomsg='>
              pairs: [
                (AssignPair
                  left: <Id.Lit_VarLike 'todomsg='>
                  lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'todomsg='> name:todomsg)
                  op: assign_op.Equal
                  rhs: {(DQ )}
                )
              ]
              redirects: []
            )
            (command.If
              if_kw: <Id.KW_If if>
              arms: [
                (IfArm
                  keyword: <Id.KW_If if>
                  cond: 
                    (condition.Shell
                      commands: [
                        (command.Sentence
                          child: 
                            (command.Simple
                              blame_tok: <Id.Lit_LBracket '['>
                              more_env: []
                              words: [
                                {<Id.Lit_LBracket '['>}
                                {($ Id.VSub_DollarName n)}
                                {<-eq>}
                                {<11>}
                                {<Id.Lit_RBracket ']'>}
                              ]
                              redirects: []
                              do_fork: T
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  then_kw: <Id.KW_Then then>
                  action: [
                    (command.ShAssignment
                      left: <Id.Lit_VarLike 'todomsg='>
                      pairs: [
                        (AssignPair
                          left: <Id.Lit_VarLike 'todomsg='>
                          lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'todomsg='> name:todomsg)
                          op: assign_op.Equal
                          rhs: {(DQ <' # TODO: racy testcase'>)}
                        )
                      ]
                      redirects: []
                    )
                  ]
                  spids: [138 151]
                )
              ]
              else_action: []
              fi_kw: <Id.KW_Fi fi>
              redirects: []
            )
            (command.ShAssignment
              left: <Id.Lit_VarLike 'output='>
              pairs: [
                (AssignPair
                  left: <Id.Lit_VarLike 'output='>
                  lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'output='> name:output)
                  op: assign_op.Equal
                  rhs: 
                    {
                      (CommandSub
                        left_token: <Id.Left_DollarParen '$('>
                        child: 
                          (command.Simple
                            blame_tok: <Id.Left_DollarParen '$('>
                            more_env: []
                            words: [
                              {
                                (CommandSub
                                  left_token: <Id.Left_DollarParen '$('>
                                  child: 
                                    (command.Simple
                                      blame_tok: <dirname>
                                      more_env: []
                                      words: [{<dirname>} {($ Id.VSub_Number 0)}]
                                      redirects: []
                                      do_fork: T
                                    )
                                  right: <Id.Eof_RParen _>
                                ) <'/flock_helper'>
                              }
                              {<.>}
                              {($ Id.VSub_DollarName n)}
                            ]
                            redirects: []
                            do_fork: T
                          )
                        right: <Id.Eof_RParen _>
                      )
                    }
                )
              ]
              redirects: []
            )
            (command.If
              if_kw: <Id.KW_If if>
              arms: [
                (IfArm
                  keyword: <Id.KW_If if>
                  cond: 
                    (condition.Shell
                      commands: [
                        (command.Sentence
                          child: 
                            (command.Pipeline
                              children: [
                                (command.Simple
                                  blame_tok: <echo>
                                  more_env: []
                                  words: [{<echo>} {(DQ ($ Id.VSub_DollarName output))}]
                                  redirects: []
                                  do_fork: T
                                )
                                (command.Simple
                                  blame_tok: <grep>
                                  more_env: []
                                  words: [{<grep>} {<-q>} {<SUCCEED>}]
                                  redirects: []
                                  do_fork: T
                                )
                              ]
                              ops: [<Id.Op_Pipe _>]
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  then_kw: <Id.KW_Then then>
                  action: [
                    (command.Simple
                      blame_tok: <echo>
                      more_env: []
                      words: [
                        {<echo>}
                        {(DQ <'ok '> ($ Id.VSub_DollarName n) ($ Id.VSub_DollarName todomsg))}
                      ]
                      redirects: []
                      do_fork: T
                    )
                  ]
                  spids: [179 196]
                )
              ]
              else_kw: <Id.KW_Else else>
              else_action: [
                (command.Simple
                  blame_tok: <echo>
                  more_env: []
                  words: [
                    {<echo>}
                    {(DQ <'not ok '> ($ Id.VSub_DollarName n) ($ Id.VSub_DollarName todomsg))}
                  ]
                  redirects: []
                  do_fork: T
                )
                (command.Simple
                  blame_tok: <echo>
                  more_env: []
                  words: [{<echo>} {(DQ ($ Id.VSub_DollarName output))}]
                  redirects: [(Redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})]
                  do_fork: T
                )
              ]
              fi_kw: <Id.KW_Fi fi>
              redirects: []
            )
          ]
          right: <Id.KW_Done done>
        )
      redirects: []
    )
  ]
)