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With Rust 1.88, the cfg predicate language now backs Boolean literals, true and false, appearing as a configuration that’s all the time enabled or disabled. This works in Rust conditional compilation with cfgand cfg_attr attributes, within the built-in cfg! macro, and in Cargo [target] tables in each configuration and manifests, the Rust group mentioned. Beforehand, empty predicate lists could possibly be used for unconditional configuration, like cfg(all()) for enabled and cfg(any()) for disabled, however cfg(true) and cfg(false) provide a extra direct strategy to say what is supposed, the group mentioned.
Additionally with Rust 1.88, let statements now may be chained (&&) inside if and whereas situations, and even intermingle with Boolean expressions. Thusly, there’s much less distinction between if and if let and between whereas and whereas let. The patterns contained in the let sub-expressions may be refutable or irrefutable, and bindings are usable in later components of the chain in addition to the physique, in accordance with the Rust group.
Lastly, the Cargo bundle supervisor now robotically runs rubbish assortment on the cache in its residence listing. In explaining this modification, the Rust group mentioned that when constructing, Cargo downloads and caches crates wanted as dependencies. Traditionally, these downloaded recordsdata have been by no means cleaned up, resulting in an unbounded quantity of disk utilization in Cargo’s residence listing. With Rust 1.88, Cargo introduces a rubbish assortment mechanism to robotically clear up previous recordsdata.
