code: def p_ioport_head(self, p):
          'ioport_head : sigtypes portname'
          p[0] = self.create_ioport(p[1], p[2], lineno=p.lineno(2))
          p.set_lineno(0, p.lineno(1)f p_ioport_head(self, p):
          'ioport_head : sigtypes portname'
          p[0] = self.create_ioport(p[1], p[2], lineno=p.lineno(2))
          p.set_lineno(0, p.lineno(1))
docs: ioport_head : sigtypes portname