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Mr Steal Your Feature is at it again. twitter.com/svensauleau/st

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From who though.

To make a language evolve in the right directions you can take the best ideas in other language. Usually users are already happy with these.

To answer your question it was mainly Rust.

Only Andrew knows what he meant though.

But if Rust, then who did Rust steal it from?

I suppose from

. I have no idea

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This style of pattern matching comes from the ML line of languages. You can push it back further though, to PAL, SASL, NPL, etc.