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  1. or download this
    use strict;
use warnings;
...

f(1);
f(2);
  2. or download this
    >
Use of uninitialized value in join or string at U:\develsv\ARTS\playgr
+ound\callertest.pl line 7.
...
main,U:\develsv\ARTS\playground\callertest.pl,16,main::f,1,,,,2,UUUUUU
+UUUUU
test caller 2
elements:0