The perllexwarn document describes how to enable and disable specific categories of warnings, and it shows the category tree that is used for classifying the warnings. However, sometimes it takes a little bit of trial and error to figure out the category for a specific warning. For example, today I saw this warning for the first time: 
Value of <HANDLE> construct can be "0"; test with defined() at -e line 1

This comes from a line like this:

$s = <$fh> or die;

Let's say that I want to disable this type of warning. Which type is it? Since none of the categories seemed particularly relevant, I decided to try no warnings qw(misc), and it worked! Ok, so the categories are reasonably intuitive. But has anyone compiled a list of warnings by category? That would be helpful for the more ambiguous cases, or for educational purposes.

In reply to A list of warnings by category? by itub

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