this post was submitted on 08 Jul 2023
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*grumble*. I dabbled in Scala a few years back and I am really grumpy every time I remember that Go doesn't have sum types, pattern matching, and the closed union of types construction you can create with an abstract final class in Scala. I loved that last one and used the heck out of it. I would love to have a compiler-enforced guarantee that a set of types was closed and could not be extended.