Yup; normally assignment doesn't trigger any warnings, but if there's magic attached to the assignee, it may. Here's another example: 
$ perl -we'$|="abc"'
Argument "abc" isn't numeric in scalar assignment at -e line 1.

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In reply to Re^3: Uninitialised value in list assignment by ysth
in thread Uninitialised value in list assignment by Tanktalus

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