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A systems programming language focused on safety and performance. Guarantees memory safety without a garbage collector.
Graydon Hoare started Rust as a personal project at Mozilla in 2006, and Mozilla officially sponsored it from 2009 until the Rust Foundation took stewardship in 2021. Rust's defining innovation is its ownership system — a set of compile-time rules that guarantee memory safety and thread safety without a garbage collector. The borrow checker enforces that references are either shared or mutable but never both simultaneously, eliminating entire categories of bugs including data races, dangling pointers, and use-after-free errors at compile time. This makes Rust uniquely suited for systems programming, embedded development, WebAssembly, operating system components, and security-critical applications.
The Linux kernel accepted Rust as a second implementation language in 2022, and Microsoft, Google, Amazon, and Cloudflare use it extensively in production. Rust's trait system provides zero-cost abstractions for polymorphism, and its enum types with pattern matching enable expressive algebraic data types. The Cargo package manager and build system, combined with crates.io hosting over 150,000 crates, provide one of the best dependency management experiences in systems programming. Async Rust, powered by runtimes like Tokio, handles high-concurrency workloads for web servers and network services.
The language's error handling through Result and Option types enforces explicit handling of failure cases. Despite a famously steep learning curve — particularly around lifetimes and the borrow checker — Rust has been voted the most admired programming language in Stack Overflow's developer survey for multiple consecutive years.
Rust's ownership model means that changes to lifetime annotations, borrow patterns, and unsafe blocks have correctness implications that the compiler normally guarantees. Comparing files catches modified unsafe blocks that bypass safety guarantees, altered lifetime parameters that change reference validity, changed trait implementations that affect generic code, and updated Cargo.toml dependencies that may introduce vulnerabilities.
Reviewing diffs of unsafe code is especially critical since those sections carry the full responsibility of manual memory safety verification.
UtraDiff compares Rust files with Rust syntax highlighting, rendering lifetime annotations, trait bounds, and macro invocations in distinct colors. Side-by-side view aligns impl blocks and match arms across panels for ownership-focused review. The whitespace ignore toggle suppresses rustfmt-only changes.
Alt+Arrow navigation jumps between modified functions, critical for reviewing unsafe blocks. Language-aware tokenization separates type parameter changes from value-level edits.
Supported extensions: .rs