What's New in Rust 1.42 and 1.43

Jon and Ben examine the features of Rust 1.42 and Rust 1.43.

Contributing to Rustacean Station

Rustacean Station is a community project; get in touch with us if you’d like to suggest an idea for an episode or offer your services as a host or audio editor!

• Twitter: @rustaceanfm
• Discord: Rustacean Station
• Github: @rustacean-station
• Email: [email protected]

Timestamps & referenced resources

• [@01:45] - Useful line numbers on unwrap
  • #[track_caller]
• [@04:22] - Subslice patterns
  • Stabilization report
  • Ignoring with ..
  • @-patterns
  • struct updates with ..
• [@16:09] - matches!
  • Macro documentation
  • Jon proposes assert_matches
• [@18:13] - Error::description deprecation
  • RFC
  • Soft deprecation in 1.27
  • failure
  • thiserror
  • anyhow
  • eyre
  • Jane expermenting with track_caller in eyre
• [@24:23] - Other changes in 1.42
  • Documentation improvements to cargo
• [@26:47] - Rust 1.43
• [@27:17] - item macro fragments and parser improvements in general
  • More details about the problem
  • PR that fixed this
• [@33:30] - Primitive type inference
• [@36:22] - Smaller changes surfacing in release notes
  • Steve Klabnik’s blog post
  • Rust 2020 roadmap on “finishing things”
• [@39:00] - New cargo environment variables
  • Cargo target directory
  • assert_cmd
  • Environment variables set by cargo
• [@43:39] - Associated consts on numeric types
  • Ben’s RFC
  • Issue from way back when
  • The associated constants PR (2015)
  • max_value PR (2015)
  • PR for Ben’s RFC
• [@51:54] - What can we do in an edition?
  • Error::source RFC
• [@54:20] - The primitive module
  • use paths
  • The Rust prelude
  • Next edition prelude
• [@57:50] - String implements AsMut
• [@59:40] - cargo profile in config
  • cargo global configuration
• [@1:02:03] - New feature resolver
  • cargo merges features between dependency types
• [@1:05:30] - Lots of new clippy lints: 1.42, 1.43
  • All the clippy lints
  • Pruning unwanted clippy lints
• [@1:08:52] - Rustfest postponed

Credits

Intro Theme: Aerocity

Audio Editing: @alphastrata

Hosting Infrastructure: Jon Gjengset

Show Notes: Jon Gjengset

Hosts: Jon Gjengset and Ben Striegel