shadower @shadower@mastodon.social
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TIL about the RUSTC_BOOTSTRAP environment variable. By setting it, you can use unstable language features (i.e. anything behind a `#![feature(...)]` gate) on stable rustc.

I always assumed you needed to be on nightly for that, but this is an escape hatch.

It's used in Rust for Linux to build the Rust modules with a stable compiler (which is how I found out about it today).

doc.rust-lang.org/beta/unstabl

RUSTC_BOOTSTRAP - The Rust Unstable Book

doc.rust-lang.org

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