[Jprogramming] unwind protect

[Elijah Stone]

On Sat, 30 Apr 2022, Elijah Stone wrote:

> (is it possible to avoid duplication of the monadic and dyadic cases?)

(hmm, I have an ugly solution: preprocess u and v into x&u and x&v in the 
dyadic case st u y and v y always do the right thing.  Slightly less abusive 
to the notation but no less ugly would be to make u'' and v'' always do the 
right thing.  But I have no pretty solution.)