-`rustup` uses cargo [features](https://doc.rust-lang.org/cargo/reference/features.html) in order to setup [conditional compilation](https://doc.rust-lang.org/reference/conditional-compilation.html) for integration tests as the `#[cfg(test)]` is only available for unit tests. To this end, the `test` feature has been created, however it then needs to be activated in order for tests and linting to fully work. As a shortcut we then propose to activate all features. However, if you encounter an issue, you could try activating only the `test` feature by setting the `rust-analyzer.cargo.features` configuration to `["test"]`.
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