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Right, you can pass a function:

final_function(fun() -> maybe_function(X) end)

or

final_function(maybe_function, X)

if final_function does:

final_function(Function, X) -> Function(X).

Small thing, but `final_function` here needs to be passed `fun maybe_function/1`, not the atom `maybe_function` alone.

Oops, yup. Meant to make it explicit since you can also do: ?MODULE:Function(X)