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Add a FAQ entry about RA and Cargo interaction

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Jakub Beránek 2025-09-09 09:12:09 +02:00
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docs/book/src/faq.md
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@ -5,3 +5,12 @@
rust-analyzer fails to resolve `None`, and thinks you are binding to a variable
named `None`. That's usually a sign of a corrupted sysroot. Try removing and re-installing
it: `rustup component remove rust-src` then `rustup component install rust-src`.
### Rust Analyzer and Cargo compete over the build lock
Rust Analyzer invokes Cargo in the background, and it can thus block manually executed
`cargo` commands from making progress (or vice-versa). In some cases, this can also cause
unnecessary recompilations caused by cache thrashing. To avoid this, you can configure
Rust Analyzer to use a [different target directory](./configuration.md#cargo.targetDir).
This will allow both the IDE and Cargo to make progress independently, at the cost of
increased disk space usage caused by the duplicated artifact directories.