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docs: add note about Cargo.toml lint config #15700

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12 changes: 12 additions & 0 deletions book/src/configuration.md
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Expand Up @@ -93,6 +93,18 @@ To deny `clippy::enum_glob_use`, put the following in the `Cargo.toml`:
[lints.clippy]
enum_glob_use = "deny"
```
> **Note:**
> The `[lints.clippy]` table in `Cargo.toml` can **only** be used to set lint
> *levels* (`allow`, `warn`, `deny`).
>
> It does **not** support Clippy-specific configuration options (such as
> `allowed-duplicate-crates`, `disallowed-names`, etc.).
> For those, you must still use a separate `clippy.toml` (or `.clippy.toml`)
> file placed at the root of your project.
>
> Although [RFC 3389](https://rust-lang.github.io/rfcs/3389-manifest-lint.html)
> proposes extending `Cargo.toml` to support full lint configuration, this is
> **not yet implemented**.

For more details and options, refer to the Cargo documentation.

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