1. Introduction
2. 1. What are editions?
3. 1. 1.1. Creating a new project
   2. 1.2. Transitioning an existing project to a new edition
   3. 1.3. Advanced migrations
4. 2. Rust 2015
5. 3. Rust 2018
6. 1. 3.1. Path and module system changes
   2. 3.2. Anonymous trait function parameters deprecated
   3. 3.3. New keywords
   4. 3.4. Method dispatch for raw pointers to inference variables
   5. 3.5. Cargo changes
7. 4. Rust 2021
8. 1. 4.1. Additions to the prelude
   2. 4.2. Default Cargo feature resolver
   3. 4.3. IntoIterator for arrays
   4. 4.4. Disjoint capture in closures
   5. 4.5. Panic macro consistency
   6. 4.6. Reserved syntax
   7. 4.7. Raw lifetimes
   8. 4.8. Warnings promoted to errors
   9. 4.9. Or patterns in macro-rules
   10. 4.10. C-string literals
9. 5. Rust 2024
10. 1. 5.1. Language
    2. 1. 5.1.1. RPIT lifetime capture rules
       2. 5.1.2. if let temporary scope
       3. 5.1.3. let chains in if and while
       4. 5.1.4. Tail expression temporary scope
       5. 5.1.5. Match ergonomics reservations
       6. 5.1.6. Unsafe extern blocks
       7. 5.1.7. Unsafe attributes
       8. 5.1.8. unsafe_op_in_unsafe_fn warning
       9. 5.1.9. Disallow references to static mut
       10. 5.1.10. Never type fallback change
       11. 5.1.11. Macro fragment specifiers
       12. 5.1.12. Missing macro fragment specifiers
       13. 5.1.13. gen keyword
       14. 5.1.14. Reserved syntax
    3. 5.2. Standard library
    4. 1. 5.2.1. Changes to the prelude
       2. 5.2.2. Add IntoIterator for Box<[T]>
       3. 5.2.3. Newly unsafe functions
    5. 5.3. Cargo
    6. 1. 5.3.1. Cargo: Rust-version aware resolver
       2. 5.3.2. Cargo: Table and key name consistency
       3. 5.3.3. Cargo: Reject unused inherited default-features
    7. 5.4. Rustdoc
    8. 1. 5.4.1. Rustdoc combined tests
       2. 5.4.2. Rustdoc nested include! change
    9. 5.5. Rustfmt
    10. 1. 5.5.1. Rustfmt: Style edition
        2. 5.5.2. Rustfmt: Formatting fixes
        3. 5.5.3. Rustfmt: Raw identifier sorting
        4. 5.5.4. Rustfmt: Version sorting