something => another_thing
#Error here: Useless use of hash element in void context
means "something", another_thing
(note the quotes, see Comma Operator
for more info). Did you mean just "="?
You also seem to use $_ instead of elements in @_. Fuction arguments are in the @_ array (which is modified by shift, by the way), not in the single $_ scalar variable.
Sorry if my advice was wrong.
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