TL;DR

Rust 1.96 stabilizes the assert_matches! macro (improved assertions) and adds range support, enhancing code clarity and expressiveness.

Breaking

• Constants of type ManuallyDrop can now be used as patterns, reversing a regression from 1.94.0. (Data structure for manual resource management)

New

• assert_matches! and debug_assert_matches! macros are now stable, providing a more convenient way to check if a value matches a pattern.
• Ranges can now be iterated over using NonZero integers. (Non-zero integer type)
• Cargo now allows specifying both a Git repository and an alternate registry for dependencies.

Fixes Worth Knowing

• Security vulnerabilities CVE-2026-5222 and CVE-2026-5223 have been addressed in Cargo.
• Fixed an issue with SGX (Secure Guard Extensions) host lookup.

Before You Upgrade

• If you rely on the previous behavior of ManuallyDrop constants in patterns, review your code to ensure it still functions as expected.

TL;DR

Rust underwent a massive overhaul, fundamentally changing the language syntax and semantics, and shifting focus towards a more modern, efficient, and stable foundation.

Breaking

• Pointer Syntax: @, ~, and & pointer types removed, replaced by Box, Rc, and references respectively.
• String Types: ~str removed, use String instead.
• Keywords: Numerous keywords removed (e.g., move, fail, assert, float).
• Module System: extern mod replaced with extern crate. use mod removed.
• Library Restructuring: core renamed to std, std moved to extra (many libraries moved or removed).
• Formatting: fmt! macro removed, use print! and println! instead.
• Vector Syntax: Old fixed-length vector syntax removed.
• Mutability: Struct fields are now private by default.

New

• Cargo: Continued improvements to the package manager.
• Lifetime Elision: Simplified lifetime annotations in many cases.
• Where Clauses:

TL;DR

Rust is feature complete for 1.0, with a focus on stabilizing the core language and standard library, and shifting external crates to the Cargo package manager.

Breaking

• Integer Types: int and uint are replaced with isize and usize respectively.
• Copy Trait: No longer automatically implemented.
• Sync & Send: Now 'unsafe traits', requiring unsafe impl for manual implementation.
• Array Syntax: Fixed-length arrays are now written as [T; N].
• Show & String Formatting: Traits renamed to Debug and Display respectively, changing formatter specifiers to {:?} and {}.
• Macro Derivation: Use #[derive(...)] instead of #[deriving(...)].
• Module/Enum Imports: Use self for importing containing modules/enums alongside items (e.g., foo::{self, bar}).

New

• Associated Types: Traits can now define families of related types for generic use.
• Range Syntax: New `