Hi Doug,
Perhaps because it radically departs from Ken's
"?" in qed/ed
That spread elsewhere. When PDP-7 Unix's cp.s is given an odd number of
arguments, leaving the last unpaired, it prints the argument followed by
‘ ?’.
https://www.tuhs.org/cgi-bin/utree.pl?file=PDP7-Unix/cmd/cp.s
mes:
040000;077012
unbal:
lac name2
tad d4
dac 1f
lac d1
sys write; 1: 0; 4
lac d1
sys write; mes; 2
sys exit
--
Cheers, Ralph.