Your reduce_list is named similarly to reduce, but bears no resemblance since it doesn't to reduce at all.

• reduce allows an arbitrary state to be passed from one pass to another. Your reduce_list doesn't.

• reduce can return any value, not just the input. reduce_list can return at most one scalar, and it can only be the input. (That's not very "listy"!)

Because of those reasons, reduce is a general purpose function. (It can implement any other function in List::Util.) Your reduce_list is just grep with access to the last element.

This accounts for the differences with what I suggested it should look like.

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