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A co-worker in my shop is starting to appreciate the smell of Perl. We had a discussion about recursive function calls in general and he went off writing a small test script to get familiar with the concept.

I told him to use strict and warnings or die. He didn't want to die just yet, so he obeyed. Then he came to me asking for an explanation to something I hadn't foreseen:

#!/usr/bin/perl -w use strict; my $line; open (IN, "<david2"); open (OUT, ">temp"); while ($line = <IN>) { process($line); } exit; sub process { my $str=shift; # my $rest; ($a, $b, $rest) = split(/\s+/,$str,3); if (defined($a)){ print OUT "$a\t"; } if (defined($b)){ print OUT "$b\n"; } if (!defined($rest)){ return (0); } process($rest); }
If he runs the above script, perl will complain that $rest requires explicit package name etc. Fine. Removing the comment before my $rest will make perl happy. Fine again.

The question is: Why doesn't perl require explicit package names for $a and $b?

We have tried the script both under Solaris and Win-32 Active State, Perl 5.6 in both cases. Same result.


Everything will go worng!


In reply to use strict won't require explicit name for all variables? by Biker

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