The Rust Edition Guide

Introduction

What are editions?

• What are editions?
  • Creating a new project
  • Transitioning an existing project to a new edition
  • Advanced migrations

Rust 2015

• Rust 2015

Rust 2018

• Rust 2018
  • Path and module system changes
  • Anonymous trait function parameters deprecated
  • New keywords
  • Method dispatch for raw pointers to inference variables
  • Cargo changes

Rust 2021

• Rust 2021
  • Additions to the prelude
  • Default Cargo feature resolver
  • IntoIterator for arrays
  • Disjoint capture in closures
  • Panic macro consistency
  • Reserved syntax
  • Raw lifetimes
  • Warnings promoted to errors
  • Or patterns in macro-rules
  • C-string literals

Rust 2024

• Rust 2024
  • Language
    • RPIT lifetime capture rules
    • if let temporary scope
    • let chains in if and while
    • Tail expression temporary scope
    • Match ergonomics reservations
    • Unsafe extern blocks
    • Unsafe attributes
    • unsafe_op_in_unsafe_fn warning
    • Disallow references to static mut
    • Never type fallback change
    • Macro fragment specifiers
    • Missing macro fragment specifiers
    • gen keyword
    • Reserved syntax
  • Standard library
    • Changes to the prelude
    • Add IntoIterator for Box<[T]>
    • Newly unsafe functions
  • Cargo
    • Cargo: Rust-version aware resolver
    • Cargo: Table and key name consistency
    • Cargo: Reject unused inherited default-features
  • Rustdoc
    • Rustdoc combined tests
    • Rustdoc nested include! change
  • Rustfmt
    • Rustfmt: Style edition
    • Rustfmt: Formatting fixes
    • Rustfmt: Raw identifier sorting
    • Rustfmt: Version sorting