Pattern-matching with (higher-order) functions in Haskell?

Remove the around the x . Otherwise the 2nd pattern can only match lists with 1 element only.

There are two basic 'constructors' for lists, and thus two basic cases you need to consider in defining functions from lists: arguments of the form and (:). The latter, (:) can join anything with a list of that kind of thing, thus 1 with -- 1: or 1. Or it can join 1 with something of just that kind: 1:(1:) i.e.

1:1, i.e. 1,1 as the special syntax lets us write.

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