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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
- Nightly Rust
- mdbook
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.
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
SPEC_RELATIVE
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.
The published site at https://doc.rust-lang.org/reference/ (or local docs using rustup doc
) does not set this, which means it will use relative links which supports offline viewing and links to the correct version (for example, links in https://doc.rust-lang.org/1.81.0/reference/ will stay within the 1.81.0 directory).
SPEC_DENY_WARNINGS
The SPEC_DENY_WARNINGS=1
environment variable will turn all warnings generated by mdbook-spec
to errors. This is used in CI to ensure that there aren't any problems with the book content.
SPEC_RUST_ROOT
The SPEC_RUST_ROOT
can be used to point to the directory of a checkout of https://github.com/rust-lang/rust. This is used by the test-linking feature so that it can find tests linked to reference rules. If this is not set, then the tests won't be linked.