http://search.cpan.org/src/RGARCIA/perl-5.10.0/lib/diagnostics.pm 
sub import {
    shift;
    $^W = 1; # yup, clobbered the global variable; 
         # tough, if you want diags, you want diags.
    return if defined $SIG{__WARN__} && ($SIG{__WARN__} eq \&warn_trap
+);
...

[download]
perllexwarn

In reply to Re^2: Use of uninitialized value in require at ...AutoLoader.pm ? by Anonymous Monk
in thread Use of uninitialized value in require at ...AutoLoader.pm ? by jvector

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