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document `skip-std-check-if-no-download-rustc` in rustc-dev-guide 

Signed-off-by: onur-ozkan <work@onurozkan.dev>
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onur-ozkan 2025-06-04 15:16:57 +03:00
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@ -59,6 +59,14 @@ always overrides the inner ones.
## Configuring `rust-analyzer` for `rustc`
### Checking the "library" tree
Checking the "library" tree requires a stage1 compiler, which can be a heavy process on some computers.
For this reason, bootstrap has a flag called `--skip-std-check-if-no-download-rustc` that skips checking the
"library" tree if `rust.download-rustc` isn't available. If you want to avoid putting a heavy load on your computer
with `rust-analyzer`, you can add the `--skip-std-check-if-no-download-rustc` flag to your `./x check` command in
the `rust-analyzer` configuration.
### Project-local rust-analyzer setup
`rust-analyzer` can help you check and format your code whenever you save a