Recursive printing is broken

[pdarragh]

When we have self-referential heap structures, the output loops infinitely and must be interrupted:

> (let ([v (make-vector 1 #t)]) (begin (vector-set! v 0 v) v))
#0='#(#0#)
> (run (compile (parse '(let ([v (make-vector 1 #t)]) (begin (vector-set! v 0 v) v)))))
^Cuser break [,bt for context]

It'd be nice to implement a (simple) check for these cases and indicate the recursion somehow.

[laelath]

It looks like Racket resolves these by printing out the recursive equations i.e. for this example it prints #0='#(#0#).