What's New in Rust 1.56 and 1.57

Jon and Ben discuss the highlights of the 1.56 and 1.57 releases of Rust.

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Timestamps & referenced resources

[@01:14] - Rust 2021 edition

• [@01:16] - What is an edition?
• [@05:03] - Disjoint captures in closures
  • Niko’s “view types” proposal
• [@09:00] - IntoIterator for arrays
• [@11:12] - Or patterns in macro_rules
• [@13:31] - New default Cargo feature resolver
  • Details on the new resolver
• [@15:16] - Additions to the prelude
  • std::prelude
  • FromIterator
• [@19:38] - Panic macro consistency and new reserved syntax
  • [@20:33] - Implicit formatting captures (more on Reddit)
  • [@25:00] - Reserved syntax for “f-strings”
  • [@27:54] - Why panic! had to change
  • [@28:55] - Other uses for reserved syntax
• [@30:15] - Warnings promoted to errors
  • Future incompatibility warnings
• [@35:23] - cargo fix

[@36:20] - Rust 1.56

• [@36:30] - Cargo.toml rust-version
  • Cargo book entry
• [@42:54] - New bindings in binding @ pattern
• [@44:27] - Stabilized APIs
• [@49:27] - Changelog deep-dive
  • [@49:27] - impl From<[(K, V), N]> for collections
    • RFC for adding collection literal macros
  • [@53:07] - Remove P: Unpin bound on impl Future for Pin
  • [@55:16] - Instant backsliding protection optimization
    • May end up being removed!
  • [@58:01] - LLVM 13 upgrade
    • LLVM’s new pass manager
  • [@59:23] - Have Cargo set environment variables
• [@1:00:17] - Rust 1.56.1
  • Security advisory
  • The “Trojan Source” vulnerability
  • Rust RFC on non-ASCII identifiers

[@1:04:52] - Rust 1.57

• [@1:05:20] - Panic in const contexts
• [@1:07:20] - Custom Cargo profiles
  • Cargo book on profiles
• [@1:08:45] - Fallible allocation
  • Fallible collection allocation RFC
  • Linux Torvals on handling allocation failures
  • Rust features still needed by the Linux kernel
• [@1:12:33] - Stabilized APIs
• [@1:16:45] - Changelog deep-dive
  • [@1:16:50] - Vec::leak no longer allocates
  • [@1:18:03] - Nintendo 3DS added as Tier 3 platform
  • [@1:19:03] - Cargo no longer passes through RUSTFLAGS
    • Environment variables set by Cargo
  • [@1:20:13] - Lots more #[must_use] in std
  • [@1:22:00] - File::read_to_* optimized
  • [@1:23:24] - Curly braces macros accept following . and ?
• [@1:25:22] - Banter – Rust all the way down.

Credits

Intro Theme: Aerocity

Audio Editing: Aerocity

Hosting Infrastructure: Jon Gjengset

Show Notes: Jon Gjengset

Hosts: Jon Gjengset and Ben Striegel

Transcript: Eric Seppanen