And for programmers who are desperate to use type-level integers, there exists typenum, which is an encoding of integers in Rust's type system. They can also be used to parameterize array length (the generic-array crate), one of the main uses of such a beast.

That said, I am also looking forward to true type-level integers; they're needed for the truly proper translation of fixed size arrays in the Fuchsia IDL (fidl).