27 ms·
In SICP's stop-and-copy garbage collector that was the tag on a forwarding pointer from the from-space to the to-space. Since this was written after SICP 1st ed
by abecedarius 14y ago
In SICP's stop-and-copy garbage collector that was the tag on a forwarding pointer from the from-space to the to-space. Since this was written after SICP 1st edition came out, I'd guess that's the source.