additional ackmate_ack patch to report source of utf-8 errors

gistfile1.txt

    # insert prior to line 2613 / return $buffer =~ /$regex/m;
    local $SIG{__WARN__} = sub {
      my $e = shift;
      App::Ack::warn( "$e\n  $self->{filename}:\n\nYou probably want to either convert this file to utf-8, ignore it in ~/.ackrc, or delete it.\n\n" );
      return;
    };
    # end