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#!/usr/bin/perl
use strict;
...
        print $f;
        warn ".";
}

. at test.pl line 7.
. at test.pl line 7.
ab

#!/usr/bin/perl
use strict;
...
        print $f;
        warn ;
}

Warning: something's wrong at test.pl line 7.
Warning: something's wrong at test.pl line 7.
a1

$ perl -v

This is perl, v5.8.8 built for i486-linux-gnu-thread-multi