http://www.perlmonks.org?node_id=998729


in reply to Checking for duplicate subroutine names

use warnings;

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I'm not a Perl expert either, but -w and 'use warnings' apparently aren't the same:

VinsWorldcom@C:\Users\VinsWorldcom\tmp> test.pl
Subroutine s1 redefined at C:\Users\VinsWorldcom\tmp\test.pl line 9.
calling s1...
hi 2 you

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In Section Seekers of Perl Wisdom