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wtf is rust?

rust-lang/rust — explained in plain English

Analysis updated 2026-06-20

★ 112,573RustAudience · developerComplexity · 5/5LicenseSetup · hard

TL;DR

The official source code for the Rust programming language, its compiler, standard library, and documentation, primarily for people contributing to the language itself.

Mindmap

mindmap
  root((rust))
    What is here
      Language compiler
      Standard library
      Documentation
    Language goals
      Performance
      Memory safety
      Concurrency safety
    Tooling
      Cargo package manager
      rustfmt formatter
      Clippy linter
      rust-analyzer
    Who uses this repo
      Language contributors
      Compiler researchers
      Systems programmers

Code map

Detail Auto

An interactive map of this repo's files and how they connect — its source is parsed live in your browser. Click Visualize to build it.

filefunction / class

Why would anyone build with this?

REASON 1

Contribute a bug fix or new language feature to the Rust compiler itself.

REASON 2

Study how a modern systems-language compiler is designed and implemented in practice.

REASON 3

Build and test a custom version of Rust for an experimental platform or architecture.

REASON 4

Read the standard library source to understand how core Rust types like Vec or HashMap are implemented.

What's in the stack?

RustLLVMPythonCargo

How it stacks up

rust-lang/rustrustdesk/rustdeskdenoland/deno
Stars112,573113,602106,607
LanguageRustRustRust
Setup difficultyhardmoderateeasy
Complexity5/53/53/5
Audiencedeveloperops devopsdeveloper

Figures from each repo's GitHub metadata at analysis time.

How do you spin it up?

Difficulty · hard Time to first run · 1day+

Building the Rust compiler from source requires a working Rust toolchain, Python, and significant compile time, often 30-90 minutes.

Dual-licensed under MIT and Apache 2.0, use, modify, and distribute freely for any purpose including commercial use.

Wtf does this do

This repository is the main source code home for Rust, a programming language whose tagline is empowering everyone to build reliable and efficient software. A programming language is the set of rules and grammar developers use to write instructions a computer can run. The repo specifically contains three things: the compiler that turns Rust source code into runnable programs, the standard library that ships with the language, and the documentation. The README highlights three reasons people choose Rust. Performance, meaning programs run fast and use memory efficiently, which makes Rust suitable for critical services, embedded devices, and integrating with other languages. Reliability, achieved through a rich type system and an ownership model that catch memory and threading bugs at compile time rather than at runtime. Productivity, supported by careful compiler error messages and a tooling family: Cargo for managing packages and building projects, rustfmt for automatic formatting, Clippy as a linter to catch common mistakes, and rust-analyzer for editor integration. You would care about this repository if you are contributing to the language itself or studying how a modern compiler is built, everyday Rust users normally just install Rust through the official installers rather than building from source. The project is dual-licensed under MIT and Apache 2.0, with some portions under BSD-like licenses, and the Rust and Cargo names and logos are trademarks owned by the Rust Foundation.

Yoink these prompts

Prompt 1
I want to contribute my first bug fix to the Rust compiler. Walk me through building Rust from source on Linux using the x.py script and running the test suite.
Prompt 2
I'm studying how Rust's borrow checker works. Point me to the key source files in the compiler that implement ownership and lifetime checking and explain what each one does.
Prompt 3
Show me how to add a new lint to Clippy by following the existing pattern in the Clippy source code inside this repository.
Prompt 4
I want to understand how Rust's standard HashMap is implemented. Walk me through the key data structures and methods in the standard library source code.
Prompt 5
How do I use x.py to run a specific compiler test in rust-lang/rust, and how do I add a new test case for a bug I found?

Frequently asked questions

wtf is rust?

The official source code for the Rust programming language, its compiler, standard library, and documentation, primarily for people contributing to the language itself.

What language is rust written in?

Mainly Rust. The stack also includes Rust, LLVM, Python.

What license does rust use?

Dual-licensed under MIT and Apache 2.0, use, modify, and distribute freely for any purpose including commercial use.

How hard is rust to set up?

Setup difficulty is rated hard, with roughly 1day+ to a first successful run.

Who is rust for?

Mainly developer.

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