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unstable-book: fix capitalization #140506

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Apr 30, 2025
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unstable-book: fix capitalization #140506

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2 changes: 1 addition & 1 deletion src/doc/unstable-book/src/compiler-flags/rustc-bootstrap.md
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Expand Up @@ -23,7 +23,7 @@ Crates can fully opt out of unstable features by using [`#![forbid(unstable_feat
In particular, nightly is built with beta, and beta is built with stable.
Since the standard library and compiler both use unstable features, `RUSTC_BOOTSTRAP` is required so that we can use the previous version to build them.

## Why is this environment variable so easy to use for people not in the rust project?
## Why is this environment variable so easy to use for people not in the Rust project?

Originally, `RUSTC_BOOTSTRAP` required passing in a hash of the previous compiler version, to discourage using it for any purpose other than bootstrapping.
That constraint was later relaxed; see <https://github.com/rust-lang/rust/issues/36548> for the discussion that happened at that time.
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