Also "don't know yet". Robby
On Wed, Nov 28, 2018 at 6:15 PM Alexis King <lexi.lam...@gmail.com> wrote: > > On Nov 28, 2018, at 07:15, Matthew Flatt <mfl...@cs.utah.edu> wrote: > > > > Yes, that's special handling for pairs in the sense that the > > traditional Racket implementation takes advantage of leftover bits in a > > pair object, and it uses two of them for "is a list" and "not a list". > > > > Racket-on-Chez doesn't have the extra bits to work with, so "is a list" > > and "not a list" information is recorded separately in an `eq?`-based > > hash table. > > Why does keeping track of “is a list” and “not a list” require two bits? > It seems like a pair either is or is not a list, so one bit of information > would be sufficient. Are there situations where the system can neither be > sure that something is or is not a list? Circular lists, or something like > that? > > (This is not really important, of course, I’m just curious.) > > Alexis > > -- > You received this message because you are subscribed to the Google Groups > "Racket Users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to racket-users+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
