class Parser::Builders::Default

def unary_op(op_t, receiver) 

def unary_op(op_t, receiver)
  case value(op_t)
  when '+', '-'
    method = value(op_t) + '@'
  else
    method = value(op_t)
  end
  n(:send, [ receiver, method.to_sym ],
    send_unary_op_map(op_t, receiver))
end