code: def p_declnamelist(self, p):
          'declnamelist : declnamelist COMMA declname'
          p[0] = p[1] + (p[3],)
          p.set_lineno(0, p.lineno(1)f p_declnamelist(self, p):
          'declnamelist : declnamelist COMMA declname'
          p[0] = p[1] + (p[3],)
          p.set_lineno(0, p.lineno(1))
docs: declnamelist : declnamelist COMMA declname