Nested DO ON-ERROR scripts

Already so it is not compatible with v6…
And I repeat that it is better that I do not comment on the desire to use it on such old versions full of hacks
already known by everyone (except those who use them, apparently) worldwide…

Hahaha true… then I guess I will stick to 7.x only but then also the nested on-error thing stays… what can be done for that? any help would be appriciated