This Perl program causes wonder error. Because one space in it is fake as Unicode.

include-no-break-space.pl

#!/usr/bin/perl

use v5.10;
use strict;
use warnings;

for my $i (1..10) {
    say "num is $i";
}

__END__
$ perl -wc include-no-break-space.pl
Unrecognized character \xC2; marked by <-- HERE after <-- HERE near column 1 at moge.pl line 8.

ちなみに、C2A0の文字をクリップボードに入れるには、Macでは
$ perl -E 'say "\xC2\xA0"' | pbcopy
とすればよいです。