I took that to mean that Scala's influence on Rust is non-obvious. I might describe Scala's general design philosophy as "exuberant", whereas Rust has historically tried to have as little machinery as possible to achieve its safety goals. Scala's much more flexible, much less explicit, and much more TIMTOWTDI.

Thanks. I've done scala for a few years and only dabbled in rust but it certainly seemed plausible that various decisions in rust, about what to do and not to do, had been informed by scala. Glad to have it confirmed.