[$] Some recent and notable changes to Rust

The Rust project makes incremental releases every sixweeks, a fact that makes it easy to overlook some of theinteresting changes coming to the language, such as newABIs, better debugger support, asynchronous traits, andsupport for C strings.The end of the year provides an opportunity to look backover the past several months of updates, and to lookforward to what to expect in 2024.