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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.