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[N]BUTLAST perform a single pass over the list
authorPaul Khuong <pvk@pvk.ca>
Mon, 4 Nov 2013 18:55:10 +0000 (13:55 -0500)
committerPaul Khuong <pvk@pvk.ca>
Mon, 4 Nov 2013 18:58:10 +0000 (13:58 -0500)
The old code would first count the number of conses, and then
SUBSEQ/(RPLACD/NTHCDR).  Instead traverse the list with two offset
pointers that advance in lockstep.

Based on a patch by Johan Andersson, on lp#1245697.


No differences found
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