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Haskell does this. Basically languages that are following the ML style have this syntax including Haskell. You must not have experience with this family of languages at it is very common and a huge part of functional programming.

A good number of "functional programmers" only have experience with JavaScript these days.

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Close, I saw this when dabbling with Nim and I remember I found it confusing, since I mostly write TypeScript and that is not a thing there so my post was mostly my ignorance speaking. I guess when one is used to it it will not look confusing at all!

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