def op_groupref_exists(self, ctx):
        # <GROUPREF_EXISTS> <group> <skip> codeyes <JUMP> codeno ...
        #self._log(ctx, "GROUPREF_EXISTS", ctx.peek_code(1))
        group_start, group_end = ctx.state.get_marks(ctx.peek_code(1))
        if group_start is None or group_end is None or group_end < group_start:
            ctx.skip_code(ctx.peek_code(2) + 1)
        else:
            ctx.skip_code(3)
        return True
dataset/ETHPy150Open amrdraz/kodr/app/brython/www/src/Lib/_sre.py/_OpcodeDispatcher.op_groupref_exists/original