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Merged
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Jul 17, 2025
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Note the nightly version of Rust/Cargo needed #1664

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Note the nightly version of Rust/Cargo needed
joshtriplett Jul 16, 2025
d2ae6e6
Add caveat to discourage setting in RUSTFLAGS
joshtriplett Jul 16, 2025
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9 changes: 7 additions & 2 deletions content/inside-rust/call-for-testing-hint-mostly-unused.md
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Expand Up @@ -45,7 +45,12 @@ possible.

Applying this option to key crates you depend on (and use only a small subset
of) can provide a substantial reduction in compile time, for debug builds and
especially for release builds.
especially for release builds. The remainder of this post shows how to apply
this option selectively using Cargo, when to use it, and how it performs.

(Note that this option should *not* be applied to all crates, e.g. using
`RUSTFLAGS`. See the rest of this post for guidance on when to apply it, and
why it shouldn't be applied across the board.)

## How does this perform?

Expand Down Expand Up @@ -151,7 +156,7 @@ allow the top-level crate to override.

## How do I help?

We'd love for you to test out this feature on the latest Rust nightly compiler[^nightly].
We'd love for you to test out this feature on the latest nightly Rust and Cargo (2025-07-16 or newer)[^nightly].

[^nightly]: Make sure to run `rustup update nightly` (or however you manage your Rust releases).

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