propagate cache properly when erroring inside /_
|= {cof/cafe dir/knot}
=+ nod=(chap(s.how [dir s.how]) cof bax hon)
?: ?=($2 -.q.nod)
- (flue cof)
+ (flue p.nod)
(cope nod (flux some))
%- flux
|= doy/(map @ cage) ^- vase
