Rust 1.70.0 Launched with Enhanced Crates.io Index Protocol and New Stable Features

The latest release of the Rust programming language, version 1.70.0, comes with several notable updates and improvements designed to enhance performance and optimize the developer experience.

One significant change in this release is the introduction of the “sparse” protocol for reading the crates.io index. Enabled by default, this protocol allows for remarkable performance enhancements when accessing the index. As a result, the path to the crate cache has changed, which necessitates re-downloading dependencies. Additionally, Rust 1.70.0 offers two new types for initializing shared data: OnceCell and OnceLock. The latter type is a thread-safe variant. Developers can use these types in situations where immediate construction is not preferred. Previously, developers relied on crates such as “lazy_static” and “once_cell” to meet this requirement, but the new stable features now make those obsolete.

Another stable feature included in this version is IsTerminal, which uses the “is_terminal” method to determine whether a given file descriptor or handle signifies a terminal or TTY. Prior to the built-in implementation, developers resorted to crate functionality for achieving the same purpose. The Rust 1.70.0 release also allows for the naming of debug levels. Previously, the “-Cdebuginfo” compiler option could only accommodate numbers ranging from 0 to 2. With this update, developers can now set debug levels by name: "none" represents 0, "limited" represents 1, and "full" represents 2.

Furthermore, two additional levels are being introduced: “line-directives-only” and “line-tables-only.” The former is designed for NVPTX profiling, while the latter enables minimal usage for backtraces with filenames and line numbers.

Lastly, this release also discontinues support for unstable test options. Prior versions enabled users to choose options that had not yet been stabilized, a feature intended for use only in nightly builds. However, this restriction was not formally in place until the current release.

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