(command.CommandList
  children: [
    (C {<.>} 
      {
        (DQ 
          (command_sub
            left_token: <Id.Left_DollarParen '$('>
            command_list: 
              (command.CommandList
                children: [(C {<dirname>} {(DQ ($ Id.VSub_Number '$0'))})]
              )
          ) </bazel-common.sh>
        )
      }
    )
    (C {<bazel>} {<test>} 
      {
        (DQ 
          (braced_var_sub
            token: <Id.VSub_Name BAZEL_ARGS>
            bracket_op: (bracket_op.WholeArray op_id:Id.Lit_At)
          )
        )
      } {<//kythe/docs/schema>} {<//...>}
    )
  ]
)