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I am a bit under-educated about the exact specifics here, but I should note that this feature was originally literally dependent types.
* https://github.com/rust-lang/rfcs/pull/1657
* https://github.com/rust-lang/rfcs/issues/1930
* https://github.com/rust-lang/rfcs/pull/2000 (the design that was accepted, in the end)
(I am not actually 100% sure if rfc 2000 meets the by-the-book definition of "dependent types", my copy of Pierce has been collecting dust. Really gotta study up more on this stuff.)
I still want to try the ZZ language (https://github.com/zetzit/zz) someday. It compiles to C, and uses a SMT solver to prove that you don't index out-of-bounds at compile time. But I don't like how it lacks generics, uses C idioms, and compiles to C.