code: def p_negedgesig(self, p):
          'edgesig : NEGEDGE edgesig_base'
          p[0] = Sens(p[2], 'negedge', lineno=p.lineno(1))
          p.set_lineno(0, p.lineno(1)f p_negedgesig(self, p):
          'edgesig : NEGEDGE edgesig_base'
          p[0] = Sens(p[2], 'negedge', lineno=p.lineno(1))
          p.set_lineno(0, p.lineno(1))
docs: edgesig : NEGEDGE edgesig_base