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  1. or download this
    $ cat 666463.pl
use strict;
...
check_something();

__END__
  2. or download this
    $ perl 666463.pl
Use of uninitialized value in concatenation (.) or string at 666463.pl
+ line 23.
  3. or download this
    $ tail foo.log
[DEBUG] 2008/02/06 10:45:00 main::check_something 666463.pl:23:- somet
+hing:'hello'
[DEBUG] 2008/02/06 10:45:00 main::check_something 666463.pl:23:- somet
+hing:''
[ERROR] 2008/02/06 10:45:00 main::check_something 666463.pl:24:- somet
+hing is nothing!