What "Wide character in print" means in Perl (hint: UTF8)

 It means there is a glitch in the matrix - agents are coming!

	$ perl -le 'print "\x{2603}"';
	Wide character in print at -e line 1.
	☃
	$ perl -CSDL -le 'print "\x{2603}"';
	☃

view raw wide-character-in-print-perl-utf8.out hosted with ❤ by GitHub

(further reading)