Future directions

[trevyn]

So it looks like the ux crate is abandoned. I don't want to take over any serious maintainership of that or a similar crate, but there are some notable recent developments that may make a modern rewrite easier:

• min_const_generics going stable in rustc 1.51 (2021-03-25) stabilize #![feature(min_const_generics)] in 1.51 rust-lang/rust#79135. In particular, this may help improve compile time if only a couple of the variants are actually used.

• https://github.com/dtolnay/seq-macro - "A seq! macro to repeat a fragment of source code and substitute into each repetition a sequential numeric counter." seq!(N in 0..=2 { sum += tuple.N; });