That's "wont". Its a different word. I tested this on 5.6.1 withe following programs. In all cases the list op was removed from the execution path (so named as 'ex-list'). Now from the use of pushmark I infer there's some stack muckery so maybe while list() isn't doing anything, perhaps there is some other form of listification going on here. I'm not motivated enough to break out gdb to find out.

perl -MO=Concise -e 'for(@_){print}'
perl -MO=Concise -e 'for(@A,@B){print}'
perl -MO=Concise -e 'for(@A,@B,1){print}'
[download]