Short cut fusion
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Short cut fusion is an optimizer method that merges some function calls into one.
E.g. map f . map g can be substituted by map (f . g) and filter p . filter q can be substituted by filter (\x -> q x && p x).
It can also help to remove intermediate data structures.
E.g. computing sum [1..n] does not require an explicit list structure, and the expression is actually translated into a simple loop.
See also correctness of short cut fusion.