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The Rust Language Reference

This document is the primary reference for the Rust programming language.

This document is not normative. It may include details that are specific to rustc itself, and should not be taken as a specification for the Rust language. We intend to produce such a document someday, but this is what we have for now.

Dependencies

Installing dependencies

First, ensure that you have a recent copy of the nightly Rust compiler installed, as this is needed in order to run the tests:

rustup toolchain install nightly

Now, ensure you have mdbook installed, as this is needed in order to build the Reference:

cargo install --locked mdbook

Building

To build the Reference, first clone the project:

git clone https://github.com/rust-lang/reference.git

(Alternatively, if you don't want to use git, download a ZIP file of the project, extract it using your preferred tool, and rename the top-level directory to reference.)

Now change your current directory to the working directory:

cd reference

To test all of the code examples in the Reference, run:

mdbook test

For authors, consider using the server functionality which supports automatic reload.

To build the Reference locally (in build/) and open it in a web browser, run:

SPEC_RELATIVE=0 mdbook build --open

This will open a browser with a websocket live-link to automatically reload whenever the source is updated.

The SPEC_RELATIVE=0 environment variable makes links to the standard library go to https://doc.rust-lang.org/ instead of being relative, which is useful when viewing locally since you normally don't have a copy of the standard library.

You can also use mdbook's live webserver option, which will automatically rebuild the book and reload your web browser whenever a source file is modified:

SPEC_RELATIVE=0 mdbook serve --open

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