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This kind of thing has been very standard in other ML family languages for decades now. Rust is a nice language, but it’s frustrating when its proponents act as if it’s the first language to have these kind of features. ML is 50 years old at this point…

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Everything that was old is new again. I’m glad that features that were relegated to “esoteric” languages like ML's and lisps are becoming more mainstream. There are many lucky 10k’s! :)

rust mainstreaming a lot of functional concepts and patterns is awesome very much agree, just pushing back on the claim that this it’s the only language where this style is prevalent.

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