Thanks for your answers, everyone - and diotalevi in particular.   A couple of related questions:

How exactly is "in module" defined? Playing some more with this shows that do "WarnMe.pm"; for example (instead of use WarnMe;) also does not yield the warning (with or without the package declaration).

Is there some way to enable/force this warn feature explicitly in modules?

Is there a listing somewhere (within source code is fine) of which warnings do apply in which contexts (like "in module", etc.)?

Thanks.

In reply to Re: "possible typo" warnings in modules by almut
in thread "possible typo" warnings in modules by almut

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