If you are talking about "Here is an example of a complete workload that measures performance of selecting rows by random keys", then you are looking at Rune co

If you are talking about "Here is an example of a complete workload that measures performance of selecting rows by random keys", then you are looking at Rune code rather than Rust code. See https://rune-rs.github.io/book/template_literals.html https://rune-rs.github.io/book/template_literals.html