>perl -wMstrict -le
"print exists &utf8::is_utf8 ? 'yes' : 'no';
 print \&utf8::is_utf8;
 ;;
 print exists &utf8::utf8 ? 'yes' : 'no';
 print \&utf8::utf8;
"
yes
CODE(0x68c66c)
no
CODE(0x68c17c)