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perl 5.20.2-3%2Bdeb8u11
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Test warnings related to $/
__END__
-w
# warnable code, warnings enabled via command line switch
$/ = \0;
EXPECT
Setting $/ to a reference to zero as a form of slurp is deprecated, treating as undef at - line 3.
########
-w
# warnable code, warnings enabled via command line switch
$/ = \-1;
EXPECT
Setting $/ to a reference to a negative integer as a form of slurp is deprecated, treating as undef at - line 3.