You can also check my
Can you use string as a HASH ref while "strict refs" in use? for a hard to debug behaviour you can get without
strict 'refs' (and how to get the same confusing behaviour with strict, too).
map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]