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You mean a piecewise definition of a function? I don't think this is unidiomatic or discouraged in Haskell at all.

There's some indirect discussion here that seems to contradict that, but I certainly could be wrong.

https://github.com/elm/compiler/issues/973

That's in the context of Elm, Evan gives his reasons but in the context of Haskell such multi-line equations are very common and normal Haskell style.

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