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Oct 19, 2025
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Expand RUSTUP_TOOLCHAIN_SOURCE's documentation #4549

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2 changes: 1 addition & 1 deletion doc/user-guide/src/environment-variables.md
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Expand Up @@ -72,7 +72,7 @@
- `RUSTUP_CONCURRENT_DOWNLOADS` *unstable* (default: the number of components to download). Controls the number of
downloads made concurrently.

- `RUSTUP_TOOLCHAIN_SOURCE` *unstable*. Set by rustup to tell proxied tools how `RUSTUP_TOOLCHAIN` was determined.
- `RUSTUP_TOOLCHAIN_SOURCE` *unstable*. Set by rustup to tell proxied tools how `RUSTUP_TOOLCHAIN` was determined. Non-rustup tools should not set this environment variable, except insofar as to mirror an earlier invocation from rustup.

[directive syntax]: https://docs.rs/tracing-subscriber/latest/tracing_subscriber/filter/struct.EnvFilter.html#directives
[dc]: https://docs.docker.com/storage/storagedriver/overlayfs-driver/#modifying-files-or-directories
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