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Mention RUSTC_SAVE_ANALYSIS in contributing.md #530

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Mention RUSTC_SAVE_ANALYSIS in contributing.md #530

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5 changes: 2 additions & 3 deletions contributing.md
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Expand Up @@ -173,11 +173,10 @@ Everything should now work! You may need to restart the RLS.

### Build it yourself

When you build Rust, add `-Zsave-analysis-api` to your stage 2 flags, e.g., by
setting the environment variable:
When you build Rust, run it with a `RUSTC_SAVE_ANALYSIS=api` environment variable, e.g. with:

```
export RUSTFLAGS_STAGE2='-Zsave-analysis-api'
RUSTC_SAVE_ANALYSIS=api ./x.py build
```

When the build has finished, you should have a bunch of JSON data in a directory like
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