(command.CommandList
  children: [
    (command.Simple blame_tok:<set> more_env:[] words:[{<set>} {<-e>}] redirects:[] do_fork:T)
    (command.Simple
      blame_tok: <set>
      more_env: []
      words: [{<set>} {<-o>} {<pipefail>}]
      redirects: []
      do_fork: T
    )
    (command.ShFunction
      name_tok: <errexit>
      name: errexit
      body: 
        (BraceGroup
          left: <Id.Lit_LBrace '{'>
          children: [
            (command.Simple
              blame_tok: <echo>
              more_env: []
              words: [{<echo>} {(DQ ($ Id.VSub_Number 1))}]
              redirects: []
              do_fork: T
            )
            (command.ControlFlow keyword:<Id.ControlFlow_Exit exit> arg_word:{<1>})
          ]
          redirects: []
          right: <Id.Lit_RBrace '}'>
        )
    )
    (command.ShAssignment
      left: <Id.Lit_VarLike 'BUNDLE='>
      pairs: [
        (AssignPair
          left: <Id.Lit_VarLike 'BUNDLE='>
          lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'BUNDLE='> name:BUNDLE)
          op: assign_op.Equal
          rhs: 
            {
              (DQ <'bundles/'> 
                (CommandSub
                  left_token: <Id.Left_DollarParen '$('>
                  child: 
                    (command.Simple
                      blame_tok: <cat>
                      more_env: []
                      words: [{<cat>} {<VERSION>}]
                      redirects: []
                      do_fork: T
                    )
                  right: <Id.Eof_RParen _>
                )
              )
            }
        )
      ]
      redirects: []
    )
    (command.ShFunction
      name_tok: <bundle_files>
      name: bundle_files
      body: 
        (BraceGroup
          left: <Id.Lit_LBrace '{'>
          children: [
            (command.ForEach
              keyword: <Id.KW_For for>
              iter_names: [f]
              iterable: (for_iter.Words words:[{<dockerd>} {<docker-proxy>}])
              semi_tok: <Id.Op_Semi _>
              body: 
                (command.DoGroup
                  left: <Id.KW_Do do>
                  children: [
                    (command.If
                      if_kw: <Id.KW_If if>
                      arms: [
                        (IfArm
                          keyword: <Id.KW_If if>
                          cond: 
                            (condition.Shell
                              commands: [
                                (command.Sentence
                                  child: 
                                    (command.Simple
                                      blame_tok: <Id.Lit_LBracket '['>
                                      more_env: []
                                      words: [
                                        {<Id.Lit_LBracket '['>}
                                        {<-d>}
                                        {($ Id.VSub_DollarName BUNDLE) <'/dynbinary-daemon'>}
                                        {<Id.Lit_RBracket ']'>}
                                      ]
                                      redirects: []
                                      do_fork: T
                                    )
                                  terminator: <Id.Op_Semi _>
                                )
                              ]
                            )
                          then_kw: <Id.KW_Then then>
                          action: [
                            (command.Simple
                              blame_tok: <echo>
                              more_env: []
                              words: [
                                {<echo>}
                                {($ Id.VSub_DollarName BUNDLE) <'/dynbinary-daemon/'> 
                                  ($ Id.VSub_DollarName f)
                                }
                              ]
                              redirects: []
                              do_fork: T
                            )
                          ]
                          spids: [109 121]
                        )
                      ]
                      else_kw: <Id.KW_Else else>
                      else_action: [
                        (command.Simple
                          blame_tok: <echo>
                          more_env: []
                          words: [
                            {<echo>}
                            {($ Id.VSub_DollarName BUNDLE) <'/binary-daemon/'> 
                              ($ Id.VSub_DollarName f)
                            }
                          ]
                          redirects: []
                          do_fork: T
                        )
                      ]
                      fi_kw: <Id.KW_Fi fi>
                      redirects: []
                    )
                  ]
                  right: <Id.KW_Done done>
                )
              redirects: []
            )
            (command.ForEach
              keyword: <Id.KW_For for>
              iter_names: [f]
              iterable: 
                (for_iter.Words
                  words: [
                    {<docker-containerd>}
                    {<docker-containerd-ctr>}
                    {<docker-containerd-shim>}
                    {<docker-init>}
                    {<docker-runc>}
                  ]
                )
              semi_tok: <Id.Op_Semi _>
              body: 
                (command.DoGroup
                  left: <Id.KW_Do do>
                  children: [
                    (command.Simple
                      blame_tok: <echo>
                      more_env: []
                      words: [
                        {<echo>}
                        {($ Id.VSub_DollarName BUNDLE) <'/binary-daemon/'> ($ Id.VSub_DollarName f)}
                      ]
                      redirects: []
                      do_fork: T
                    )
                  ]
                  right: <Id.KW_Done done>
                )
              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 '['>}
                                {<-d>}
                                {($ Id.VSub_DollarName BUNDLE) <'/dynbinary-client'>}
                                {<Id.Lit_RBracket ']'>}
                              ]
                              redirects: []
                              do_fork: T
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  then_kw: <Id.KW_Then then>
                  action: [
                    (command.Simple
                      blame_tok: <echo>
                      more_env: []
                      words: [{<echo>} {($ Id.VSub_DollarName BUNDLE) <'/dynbinary-client/docker'>}]
                      redirects: []
                      do_fork: T
                    )
                  ]
                  spids: [177 189]
                )
              ]
              else_kw: <Id.KW_Else else>
              else_action: [
                (command.Simple
                  blame_tok: <echo>
                  more_env: []
                  words: [{<echo>} {($ Id.VSub_DollarName BUNDLE) <'/binary-client/docker'>}]
                  redirects: []
                  do_fork: T
                )
              ]
              fi_kw: <Id.KW_Fi fi>
              redirects: []
            )
          ]
          redirects: []
          right: <Id.Lit_RBrace '}'>
        )
    )
    (command.ShFunction
      name_tok: <control_docker>
      name: control_docker
      body: 
        (BraceGroup
          left: <Id.Lit_LBrace '{'>
          children: [
            (command.Sentence
              child: 
                (command.ShAssignment
                  left: <Id.Lit_VarLike 'm='>
                  pairs: [
                    (AssignPair
                      left: <Id.Lit_VarLike 'm='>
                      lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'm='> name:m)
                      op: assign_op.Equal
                      rhs: {($ Id.VSub_Number 1)}
                    )
                  ]
                  redirects: []
                )
              terminator: <Id.Op_Semi _>
            )
            (command.ShAssignment
              left: <Id.Lit_VarLike 'op='>
              pairs: [
                (AssignPair
                  left: <Id.Lit_VarLike 'op='>
                  lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'op='> name:op)
                  op: assign_op.Equal
                  rhs: {($ Id.VSub_Number 2)}
                )
              ]
              redirects: []
            )
            (command.Pipeline
              children: [
                (command.Simple
                  blame_tok: <cat>
                  more_env: []
                  words: [{<cat>}]
                  redirects: [
                    (Redir
                      op: <Id.Redir_DLess '<<'>
                      loc: (redir_loc.Fd fd:0)
                      arg: 
                        (redir_param.HereDoc
                          here_begin: {<EOF>}
                          here_end_tok: <Id.Undefined_Tok ''>
                          stdin_parts: [
                            <'if command -v systemctl > /dev/null; then\n'>
                            <'  systemctl '>
                            ($ Id.VSub_DollarName op)
                            <' docker\n'>
                            <'elif command -v service > /dev/null; then\n'>
                            <'  service docker '>
                            ($ Id.VSub_DollarName op)
                            <'\n'>
                            <'elif [ -x /etc/init.d/docker ]; then\n'>
                            <'  /etc/init.d/docker '>
                            ($ Id.VSub_DollarName op)
                            <'\n'>
                            <'else\n'>
                            <'  echo '>
                            <Id.Right_DoubleQuote '"'>
                            <'not sure how to control the docker daemon'>
                            <Id.Right_DoubleQuote '"'>
                            <'\n'>
                            <'  exit 1\n'>
                            <'fi\n'>
                          ]
                        )
                    )
                  ]
                  do_fork: T
                )
                (command.Simple
                  blame_tok: <docker-machine>
                  more_env: []
                  words: [{<docker-machine>} {<ssh>} {($ Id.VSub_DollarName m)} {<sudo>} {<sh>}]
                  redirects: []
                  do_fork: T
                )
              ]
              ops: [<Id.Op_Pipe _>]
            )
          ]
          redirects: []
          right: <Id.Lit_RBrace '}'>
        )
    )
    (command.ShFunction
      name_tok: <detect_prefix>
      name: detect_prefix
      body: 
        (BraceGroup
          left: <Id.Lit_LBrace '{'>
          children: [
            (command.ShAssignment
              left: <Id.Lit_VarLike 'm='>
              pairs: [
                (AssignPair
                  left: <Id.Lit_VarLike 'm='>
                  lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'm='> name:m)
                  op: assign_op.Equal
                  rhs: {($ Id.VSub_Number 1)}
                )
              ]
              redirects: []
            )
            (command.ShAssignment
              left: <Id.Lit_VarLike 'script='>
              pairs: [
                (AssignPair
                  left: <Id.Lit_VarLike 'script='>
                  lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'script='> name:script)
                  op: assign_op.Equal
                  rhs: {(SQ <'dirname $(dirname $(which dockerd))'>)}
                )
              ]
              redirects: []
            )
            (command.Pipeline
              children: [
                (command.Simple
                  blame_tok: <echo>
                  more_env: []
                  words: [{<echo>} {($ Id.VSub_DollarName script)}]
                  redirects: []
                  do_fork: T
                )
                (command.Simple
                  blame_tok: <docker-machine>
                  more_env: []
                  words: [{<docker-machine>} {<ssh>} {($ Id.VSub_DollarName m)} {<sh>}]
                  redirects: []
                  do_fork: T
                )
              ]
              ops: [<Id.Op_Pipe _>]
            )
          ]
          redirects: []
          right: <Id.Lit_RBrace '}'>
        )
    )
    (command.ShFunction
      name_tok: <install_to>
      name: install_to
      body: 
        (BraceGroup
          left: <Id.Lit_LBrace '{'>
          children: [
            (command.Sentence
              child: 
                (command.ShAssignment
                  left: <Id.Lit_VarLike 'm='>
                  pairs: [
                    (AssignPair
                      left: <Id.Lit_VarLike 'm='>
                      lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'm='> name:m)
                      op: assign_op.Equal
                      rhs: {($ Id.VSub_Number 1)}
                    )
                  ]
                  redirects: []
                )
              terminator: <Id.Op_Semi _>
            )
            (command.Sentence
              child: 
                (command.Simple
                  blame_tok: <shift>
                  more_env: []
                  words: [{<shift>}]
                  redirects: []
                  do_fork: T
                )
              terminator: <Id.Op_Semi _>
            )
            (command.ShAssignment
              left: <Id.Lit_VarLike 'files='>
              pairs: [
                (AssignPair
                  left: <Id.Lit_VarLike 'files='>
                  lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'files='> name:files)
                  op: assign_op.Equal
                  rhs: {($ Id.VSub_At '@')}
                )
              ]
              redirects: []
            )
            (command.Simple
              blame_tok: <echo>
              more_env: []
              words: [{<echo>} {(DQ ($ Id.VSub_DollarName m) <': detecting docker'>)}]
              redirects: []
              do_fork: T
            )
            (command.ShAssignment
              left: <Id.Lit_VarLike 'prefix='>
              pairs: [
                (AssignPair
                  left: <Id.Lit_VarLike 'prefix='>
                  lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'prefix='> name:prefix)
                  op: assign_op.Equal
                  rhs: 
                    {
                      (CommandSub
                        left_token: <Id.Left_DollarParen '$('>
                        child: 
                          (command.Simple
                            blame_tok: <detect_prefix>
                            more_env: []
                            words: [{<detect_prefix>} {($ Id.VSub_DollarName m)}]
                            redirects: []
                            do_fork: T
                          )
                        right: <Id.Eof_RParen _>
                      )
                    }
                )
              ]
              redirects: []
            )
            (command.Simple
              blame_tok: <echo>
              more_env: []
              words: [
                {<echo>}
                {
                  (DQ ($ Id.VSub_DollarName m) <': detected docker on '> ($ Id.VSub_DollarName prefix))
                }
              ]
              redirects: []
              do_fork: T
            )
            (command.Simple
              blame_tok: <echo>
              more_env: []
              words: [{<echo>} {(DQ ($ Id.VSub_DollarName m) <': stopping docker'>)}]
              redirects: []
              do_fork: T
            )
            (command.Simple
              blame_tok: <control_docker>
              more_env: []
              words: [{<control_docker>} {($ Id.VSub_DollarName m)} {<stop>}]
              redirects: []
              do_fork: T
            )
            (command.Simple
              blame_tok: <echo>
              more_env: []
              words: [{<echo>} {(DQ ($ Id.VSub_DollarName m) <': installing docker'>)}]
              redirects: []
              do_fork: T
            )
            (command.Pipeline
              children: [
                (command.Simple
                  blame_tok: <tar>
                  more_env: []
                  words: [
                    {<tar>}
                    {<ch>}
                    {<--transform>}
                    {(SQ <'s/.*\\///'>)}
                    {($ Id.VSub_DollarName files)}
                  ]
                  redirects: []
                  do_fork: T
                )
                (command.Simple
                  blame_tok: <docker-machine>
                  more_env: []
                  words: [
                    {<docker-machine>}
                    {<ssh>}
                    {($ Id.VSub_DollarName m)}
                    {<sudo>}
                    {<tar>}
                    {<Cx>}
                    {($ Id.VSub_DollarName prefix) <'/bin'>}
                  ]
                  redirects: []
                  do_fork: T
                )
              ]
              ops: [<Id.Op_Pipe _>]
            )
            (command.Simple
              blame_tok: <echo>
              more_env: []
              words: [{<echo>} {(DQ ($ Id.VSub_DollarName m) <': starting docker'>)}]
              redirects: []
              do_fork: T
            )
            (command.Simple
              blame_tok: <control_docker>
              more_env: []
              words: [{<control_docker>} {($ Id.VSub_DollarName m)} {<start>}]
              redirects: []
              do_fork: T
            )
            (command.Simple
              blame_tok: <echo>
              more_env: []
              words: [{<echo>} {(DQ ($ Id.VSub_DollarName m) <': done'>)}]
              redirects: []
              do_fork: T
            )
          ]
          redirects: []
          right: <Id.Lit_RBrace '}'>
        )
    )
    (command.ShFunction
      name_tok: <check_prereq>
      name: check_prereq
      body: 
        (BraceGroup
          left: <Id.Lit_LBrace '{'>
          children: [
            (command.AndOr
              children: [
                (command.Simple
                  blame_tok: <command>
                  more_env: []
                  words: [{<command>} {<-v>} {<docker-machine>}]
                  redirects: [
                    (Redir
                      op: <Id.Redir_Great '>'>
                      loc: (redir_loc.Fd fd:1)
                      arg: {<'/dev/null'>}
                    )
                  ]
                  do_fork: T
                )
                (command.Simple
                  blame_tok: <errexit>
                  more_env: []
                  words: [{<errexit>} {(DQ <'docker-machine not installed'>)}]
                  redirects: []
                  do_fork: T
                )
              ]
              ops: [<Id.Op_DPipe _>]
            )
            (command.AndOr
              children: [
                (command.Subshell
                  left: <Id.Op_LParen _>
                  child: 
                    (command.Pipeline
                      children: [
                        (command.Simple
                          blame_tok: <tar>
                          more_env: []
                          words: [{<tar>} {<--version>}]
                          redirects: []
                          do_fork: T
                        )
                        (command.Simple
                          blame_tok: <grep>
                          more_env: []
                          words: [{<grep>} {<GNU>}]
                          redirects: [
                            (Redir
                              op: <Id.Redir_Great '>'>
                              loc: (redir_loc.Fd fd:1)
                              arg: {<'/dev/null'>}
                            )
                          ]
                          do_fork: T
                        )
                      ]
                      ops: [<Id.Op_Pipe _>]
                    )
                  right: <Id.Right_Subshell _>
                  redirects: []
                )
                (command.Simple
                  blame_tok: <errexit>
                  more_env: []
                  words: [{<errexit>} {(DQ <'GNU tar not installed'>)}]
                  redirects: []
                  do_fork: T
                )
              ]
              ops: [<Id.Op_DPipe _>]
            )
          ]
          redirects: []
          right: <Id.Lit_RBrace '}'>
        )
    )
    (command.Case
      case_kw: <Id.KW_Case case>
      to_match: (case_arg.Word w:{(DQ ($ Id.VSub_Number 1))})
      arms_start: <Id.KW_In in>
      arms: [
        (CaseArm
          left: <Id.Left_DoubleQuote '"'>
          pattern: (pat.Words words:[{(DQ <install>)}])
          middle: <Id.Right_CasePat _>
          action: [
            (command.Sentence
              child: 
                (command.Simple
                  blame_tok: <shift>
                  more_env: []
                  words: [{<shift>}]
                  redirects: []
                  do_fork: T
                )
              terminator: <Id.Op_Semi _>
            )
            (command.ShAssignment
              left: <Id.Lit_VarLike 'machines='>
              pairs: [
                (AssignPair
                  left: <Id.Lit_VarLike 'machines='>
                  lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'machines='> name:machines)
                  op: assign_op.Equal
                  rhs: {($ Id.VSub_At '@')}
                )
              ]
              redirects: []
            )
            (command.Simple
              blame_tok: <check_prereq>
              more_env: []
              words: [{<check_prereq>}]
              redirects: []
              do_fork: T
            )
            (command.ShAssignment
              left: <Id.Lit_VarLike 'files='>
              pairs: [
                (AssignPair
                  left: <Id.Lit_VarLike 'files='>
                  lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'files='> name:files)
                  op: assign_op.Equal
                  rhs: 
                    {
                      (CommandSub
                        left_token: <Id.Left_DollarParen '$('>
                        child: 
                          (command.Simple
                            blame_tok: <bundle_files>
                            more_env: []
                            words: [{<bundle_files>}]
                            redirects: []
                            do_fork: T
                          )
                        right: <Id.Eof_RParen _>
                      )
                    }
                )
              ]
              redirects: []
            )
            (command.Simple
              blame_tok: <echo>
              more_env: []
              words: [{<echo>} {(DQ <'Files to be installed:'>)}]
              redirects: []
              do_fork: T
            )
            (command.ForEach
              keyword: <Id.KW_For for>
              iter_names: [f]
              iterable: (for_iter.Words words:[{($ Id.VSub_DollarName files)}])
              semi_tok: <Id.Op_Semi _>
              body: 
                (command.DoGroup
                  left: <Id.KW_Do do>
                  children: [
                    (command.Sentence
                      child: 
                        (command.Simple
                          blame_tok: <echo>
                          more_env: []
                          words: [{<echo>} {($ Id.VSub_DollarName f)}]
                          redirects: []
                          do_fork: T
                        )
                      terminator: <Id.Op_Semi _>
                    )
                  ]
                  right: <Id.KW_Done done>
                )
              redirects: []
            )
            (command.ShAssignment
              left: <Id.Lit_VarLike 'pids='>
              pairs: [
                (AssignPair
                  left: <Id.Lit_VarLike 'pids='>
                  lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'pids='> name:pids)
                  op: assign_op.Equal
                  rhs: 
                    {
                      (ShArrayLiteral
                        left: <Id.Op_LParen _>
                        words: []
                        right: <Id.Right_ShArrayLiteral _>
                      )
                    }
                )
              ]
              redirects: []
            )
            (command.ForEach
              keyword: <Id.KW_For for>
              iter_names: [m]
              iterable: (for_iter.Words words:[{($ Id.VSub_DollarName machines)}])
              semi_tok: <Id.Op_Semi _>
              body: 
                (command.DoGroup
                  left: <Id.KW_Do do>
                  children: [
                    (command.Sentence
                      child: 
                        (command.Simple
                          blame_tok: <install_to>
                          more_env: []
                          words: [
                            {<install_to>}
                            {($ Id.VSub_DollarName m)}
                            {($ Id.VSub_DollarName files)}
                          ]
                          redirects: []
                          do_fork: T
                        )
                      terminator: <Id.Op_Amp _>
                    )
                    (command.ShAssignment
                      left: <Id.Lit_VarLike 'pids+='>
                      pairs: [
                        (AssignPair
                          left: <Id.Lit_VarLike 'pids+='>
                          lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'pids+='> name:pids)
                          op: assign_op.PlusEqual
                          rhs: 
                            {
                              (ShArrayLiteral
                                left: <Id.Op_LParen _>
                                words: [{($ Id.VSub_Bang '!')}]
                                right: <Id.Right_ShArrayLiteral _>
                              )
                            }
                        )
                      ]
                      redirects: []
                    )
                  ]
                  right: <Id.KW_Done done>
                )
              redirects: []
            )
            (command.ShAssignment
              left: <Id.Lit_VarLike 'status='>
              pairs: [
                (AssignPair
                  left: <Id.Lit_VarLike 'status='>
                  lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'status='> name:status)
                  op: assign_op.Equal
                  rhs: {<0>}
                )
              ]
              redirects: []
            )
            (command.ForEach
              keyword: <Id.KW_For for>
              iter_names: [pid]
              iterable: 
                (for_iter.Words
                  words: [
                    {
                      (BracedVarSub
                        left: <Id.Left_DollarBrace '${'>
                        token: <Id.VSub_Name pids>
                        var_name: pids
                        bracket_op: (bracket_op.WholeArray op_id:Id.Lit_At)
                        right: <Id.Right_DollarBrace '}'>
                      )
                    }
                  ]
                )
              semi_tok: <Id.Op_Semi _>
              body: 
                (command.DoGroup
                  left: <Id.KW_Do do>
                  children: [
                    (command.AndOr
                      children: [
                        (command.Simple
                          blame_tok: <wait>
                          more_env: []
                          words: [{<wait>} {($ Id.VSub_DollarName pid)}]
                          redirects: []
                          do_fork: T
                        )
                        (BraceGroup
                          left: <Id.Lit_LBrace '{'>
                          children: [
                            (command.Sentence
                              child: 
                                (command.ShAssignment
                                  left: <Id.Lit_VarLike 'status='>
                                  pairs: [
                                    (AssignPair
                                      left: <Id.Lit_VarLike 'status='>
                                      lhs: 
                                        (sh_lhs_expr.Name
                                          left: <Id.Lit_VarLike 'status='>
                                          name: status
                                        )
                                      op: assign_op.Equal
                                      rhs: {($ Id.VSub_QMark '?')}
                                    )
                                  ]
                                  redirects: []
                                )
                              terminator: <Id.Op_Semi _>
                            )
                            (command.Sentence
                              child: 
                                (command.Simple
                                  blame_tok: <echo>
                                  more_env: []
                                  words: [
                                    {<echo>}
                                    {
                                      (DQ <'background process '> ($ Id.VSub_DollarName pid) 
                                        <' failed with exit status '> ($ Id.VSub_DollarName status)
                                      )
                                    }
                                  ]
                                  redirects: []
                                  do_fork: T
                                )
                              terminator: <Id.Op_Semi _>
                            )
                          ]
                          redirects: []
                          right: <Id.Lit_RBrace '}'>
                        )
                      ]
                      ops: [<Id.Op_DPipe _>]
                    )
                  ]
                  right: <Id.KW_Done done>
                )
              redirects: []
            )
            (command.ControlFlow
              keyword: <Id.ControlFlow_Exit exit>
              arg_word: {($ Id.VSub_DollarName status)}
            )
          ]
          right: <Id.Op_DSemi _>
        )
        (CaseArm
          left: <Id.Lit_Star '*'>
          pattern: (pat.Words words:[{<Id.Lit_Star '*'>}])
          middle: <Id.Right_CasePat _>
          action: [
            (command.Simple
              blame_tok: <errexit>
              more_env: []
              words: [{<errexit>} {(DQ <'Usage: '> ($ Id.VSub_Number 0) <' install MACHINES'>)}]
              redirects: []
              do_fork: T
            )
          ]
          right: <Id.Op_DSemi _>
        )
      ]
      arms_end: <Id.KW_Esac esac>
      redirects: []
    )
  ]
)