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Ocaml, F#, Rust, Kotlin (I believe), Haskell, etc

It is a common feature in languages derives from the ML family[0].

[0]: https://en.wikipedia.org/wiki/ML_(programming_language)

Kotlin doesn't have real pattern matching.

It doesn't, but at least 'when' statements will be exhaustive when working with sealed classes - which is a breath of fresh air if you enjoy working with sum types and pattern matching.

when expressions will be exhaustive, when statements will not.

Needless distinctions like that make the fresh air a little less fresh...

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