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Chapter 5. Changes in Rust Toolset in Red Hat Developer Tools 2019.3

This chapter lists some notable changes in Rust Toolset since its previous release.

5.1. Rust
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Rust has been updated from version 1.31.1 to 1.35.0. Notable changes include:

  • Changes for Rust 1.32:

    • The dbg! macro: Enable easier print-debugging, with file, line, and an expression value.
    • Final module improvements: "use" statements are more uniform. For example: allowing direct imports of enum variants.
    • Macro improvements: Macros can now match on literal tokens, and the "?" operator matches exactly 0 or 1 repetitions.
    • Library stabilizations: Integers support conversions to and from byte arrays.

  • Changes for Rust 1.33:

    • const fn improvements: Implementing constant functions now supports destructuring patterns, let bindings, assignments, and more.
    • Pinning: Provides type-level guarantees that an object in memory will not move.
    • Import as _: Anonymous imports to bring trait methods in scope without the trait name, avoiding possible conflicts.
    • Library stabilizations: Many more const methods for integers.

  • Changes for Rust 1.34:

    • Alternative cargo registries: Allows using registries other than the public crates.io, possibly mixed together.
    • ? in documentation tests: The Try operator can now be used in doc tests that specify their "return" type.
    • TryFrom and TryInto: Provide fallible conversion methods.
    • fn before_exec is deprecated in favor of unsafe fn pre_exec: Forked pre-exec environments have additional safety constraints, which is now indicated by being an unsafe call.
    • Library stabilizations: Non-zero signed integer types, from_fn and successors iterator constructors.

  • Changes for Rust 1.35:

    • Fn* closure traits implemented for Box<dyn Fn*>: Especially notable for Box<dyn FnOnce>, which wasn’t possible to call abstractly before.
    • Calling dbg!() with no argument: Updated from 1.32, it can now print just the file:line if there’s no argument.
    • Library stabilizations: float copysign, Range contains, RefCell map_split.

5.2. cargo
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The cargo tool has been updated from version 1.31.0 to 1.35.0.

5.3. cargo-vendor
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The cargo-vendor tool has been updated from version 0.1.22 to 0.1.23.

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