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rust / rust-lang / reference / refs/heads/TC/remote-caveat-about-format_args
commit48b86591c778e0b319e0a24f37adc0acf9859a03[log] [tgz]
authorTravis Cross <tc@traviscross.com>Thu Sep 25 18:27:16 2025 +0000
committerTravis Cross <tc@traviscross.com>Thu Sep 25 18:30:09 2025 +0000
tree22c17a4005dad24f858d35d9e639cf436961d8a5
parentc4195d431ed797c2218d5c130747ce6cf4fb7873 [diff]
Remove caveats related to `format_args!` expansion

The behavior of `format_args!`, with respect to `super let`, had some
caveats that we can remove now that Rust [#145880] has landed, so
let's remove our remarks on that and simplify the tests accordingly.

[#145880]: https://github.com/rust-lang/rust/issues/145880
2 files changed
tree: 22c17a4005dad24f858d35d9e639cf436961d8a5
  1. .cargo/
  2. .github/
  3. docs/
  4. mdbook-spec/
  5. src/
  6. style-check/
  7. theme/
  8. xtask/
  9. .gitattributes
  10. .gitignore
  11. book.toml
  12. CONTRIBUTING.md
  13. LICENSE-APACHE
  14. LICENSE-MIT
  15. README.md
  16. reference.md
  17. rust-toolchain.toml
  18. rustfmt.toml
  19. STYLE.md
  20. triagebot.toml
README.md

The Rust Language Reference

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

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 book/) 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.