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link to a policy on using new external crates #2761

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4819132
there is a policy now
tshepang Feb 2, 2026
8417b41
they are so many that it feels strange to list any
tshepang Feb 2, 2026
d7f5fd3
sembr src/crates-io.md
tshepang Feb 2, 2026
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18 changes: 4 additions & 14 deletions src/crates-io.md
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# crates.io dependencies

The Rust compiler supports building with some dependencies from `crates.io`.
Examples are `log` and `env_logger`.

In general,
you should avoid adding dependencies to the compiler for several reasons:

- The dependency may not be of high quality or well-maintained.
- The dependency may not be using a compatible license.
- The dependency may have transitive dependencies that have one of the above
problems.

<!-- date-check: Aug 2025 -->
Note that there is no official policy for vetting new dependencies to the compiler.
Decisions are made on a case-by-case basis, during code review.
Rust Forge has [official policy for vetting new dependencies].

## Permitted dependencies

The `tidy` tool has [a list of crates that are allowed]. To add a
dependency that is not already in the compiler, you will need to add it to the list.
The `tidy` tool has [a list of crates that are allowed].
To add a dependency that is not already in the compiler, you will need to add it to the list.

[a list of crates that are allowed]: https://github.com/rust-lang/rust/blob/9d1b2106e23b1abd32fce1f17267604a5102f57a/src/tools/tidy/src/deps.rs#L73
[official policy for vetting new dependencies]: https://forge.rust-lang.org/compiler/third-party-out-of-tree#third-party-crates
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