(command.CommandList
  children: [
    (C {<set>} {<-xe>})
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:SRC_DIR)
          op: assign_op.Equal
          rhs: 
            {
              (DQ 
                (braced_var_sub
                  token: <Id.VSub_Name SRC_DIR>
                  suffix_op: 
                    (suffix_op.Unary
                      tok: <Id.VTest_ColonHyphen ':-'>
                      arg_word: {($ Id.VSub_DollarName '$PWD')}
                    )
                )
              )
            }
          spids: [9]
        )
      ]
    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:BUILDDIR)
          op: assign_op.Equal
          rhs: 
            {
              (DQ 
                (braced_var_sub
                  token: <Id.VSub_Name BUILDDIR>
                  suffix_op: 
                    (suffix_op.Unary
                      tok: <Id.VTest_ColonHyphen ':-'>
                      arg_word: {($ Id.VSub_DollarName '$PWD') <Id.Lit_Slash '/'> <build-rir>}
                    )
                )
              )
            }
          spids: [18]
        )
      ]
    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:RKT_BUILDER_ACI)
          op: assign_op.Equal
          rhs: 
            {
              (DQ 
                (braced_var_sub
                  token: <Id.VSub_Name RKT_BUILDER_ACI>
                  suffix_op: 
                    (suffix_op.Unary
                      tok: <Id.VTest_ColonHyphen ':-'>
                      arg_word: 
                        {<coreos.com> <Id.Lit_Slash '/'> <rkt> <Id.Lit_Slash '/'> <'builder:1.3.0'>}
                    )
                )
              )
            }
          spids: [29]
        )
      ]
    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:RKT_CMD)
          op: assign_op.Equal
          rhs: 
            {
              (DQ 
                (braced_var_sub
                  token: <Id.VSub_Name RKT_CMD>
                  suffix_op: (suffix_op.Unary tok:<Id.VTest_ColonHyphen ':-'> arg_word:{<rkt>})
                )
              )
            }
          spids: [42]
        )
      ]
    )
    (C {<mkdir>} {<-p>} {($ Id.VSub_DollarName '$BUILDDIR')})
    (C {($ Id.VSub_DollarName '$RKT_CMD')} {<run>} {<--dns> <Id.Lit_Equals '='> <8.8.8.8>} {<--volume>} 
      {<src-dir> <Id.Lit_Comma ','> <Id.Lit_VarLike 'kind='> <host> <Id.Lit_Comma ','> 
        <Id.Lit_VarLike 'source='> (DQ (${ Id.VSub_Name SRC_DIR))
      } {<--volume>} 
      {<build-dir> <Id.Lit_Comma ','> <Id.Lit_VarLike 'kind='> <host> <Id.Lit_Comma ','> 
        <Id.Lit_VarLike 'source='> (DQ (${ Id.VSub_Name BUILDDIR))
      } {<--interactive>} {($ Id.VSub_DollarName '$RKT_BUILDER_ACI')} {($ Id.VSub_At '$@')}
    )
  ]
)