I added the anti-features of apply-nconc-to-register & and erase-history << since nconcing registers really zazzes things up, and erasing history almost but not really forgives a lot of problems.
NUD/USER> ^^
(2 3)
(> #:CURSOR (2 3) 4 (5 6))
NUD/USER> >>
(1 #1=(3) 4 (5 6 2 . #1#))
They don't help my True Purpose of cdr-coding a Pratt Parser, but they do make cons trees into that room in David Bowie's labyrinth
I HAVE BEEN GENEROUS UP TIL NOW BUT I CAN BE CRUEL