Hidden in the doc for warnings is this:

To determine which category a specific warning has been assigned to see perldiag.

And in perldiag it says:

Odd number of elements in hash assignment

(W misc) You specified an odd number of elements to initialize a hash, which is odd, because hashes come in key/value pairs.

So, the answer would seem to be "misc".

In reply to Re: How to disable:Odd number of elements in hash assignment warning? by hippo
in thread How to disable:Odd number of elements in hash assignment warning? by BrowserUk

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