thanks for doing this

two questions: from the perspective of a Scala dev, does Rust have a solid collections library (including persistent structures such as Scala's Vector type) with mutable counterparts (eg, ListBuffer)?

second, from a quick glance it seems Rust's top-level concurrency model (locks, thread ownership) is the polar opposite of Scala's (Actor-based)--is this correct? Scala's concurrency model (based on Erlang), along with trait-based multiple inheritance, were Scala's initial selling points for me