(C {<builtin>} 
  {
    (braced_var_sub
      token: <Id.VSub_Number 0>
      suffix_op: 
        (suffix_op.Unary
          tok: <Id.VOp1_DPound '##'>
          arg_word: {<Id.Lit_Other '*'> <Id.Lit_Slash '/'>}
        )
    )
  } 
  {
    (braced_var_sub
      token: <Id.VSub_Number 1>
      suffix_op: (suffix_op.Unary tok:<Id.VTest_Plus '+'> arg_word:{(DQ ($ Id.VSub_At '$@'))})
    )
  }
)