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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: Feb 2023 -->
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.
## 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.
[a list of crates that are allowed]: https://github.com/rust-lang/rust/blob/9d1b2106e23b1abd32fce1f17267604a5102f57a/src/tools/tidy/src/deps.rs#L73
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