Re: Will guile support R7RS terminating "equal?" in the presence of cycle?

[Mark H Weaver]

On 09/03/2012 09:55 AM, Stefan Israelsson Tampe wrote:
> To note here is that if we had
> one bit to spare for every cons representation we could do use that bit
> to mark conses as been touched and abort the ordinary equal if we find a
> mark. For x86-64 we have one such bit available which is cool.

This trick of mutating bits in the conses fails badly in case of 
multiple threads, therefore we cannot use it.

    Mark