need to write top whenever we might cons (consider always writing once at the start of the loop or using a simple vector for the stack and just undefining values when we pop)
need to write top whenever we might cons
(consider always writing once at the start of the loop or using a
simple vector for the stack and just undefining values when we pop)

spurious/chibi-scheme-mirror,spurious/chibi-scheme-mirror,spurious/chibi-scheme-mirror