in reply to Re^2: Memory leak in unicode substitution
in thread Memory leak in unicode substitution

No. use utf8; just means UTF-8 is used in the source code (both in string literals or identifiers). But even use feature qw( unicode_strings ); doesn't help here.

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]