C, Nim and Zig all benefit from static allocation and it's available in rust, so seems fair?

also, `const N` is used in rust's nqueen test, so figured it would be fine.

someone posted an `.iter().zip()` solution which benchmarks only a little slower (+10ms) than static allocation:

https://github.com/attractivechaos/plb2/pull/4#issuecomment-...