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Auto merge of #130689 - RalfJung:rustc_nonnull_optimization_guaranteed, r=jieyouxu

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fix rustc_nonnull_optimization_guaranteed docs

As far as I can tell, even back when this was [added](https://github.com/rust-lang/rust/pull/60300) it never *enabled* any optimizations. It just indicates that the FFI compat lint should accept those types for NPO.
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bors 2024-09-22 10:18:59 +00:00
commit 4ae36d906f
4 changed files with 8 additions and 4 deletions
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6
compiler/rustc_feature/src/builtin_attrs.rs
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@ -859,8 +859,10 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
rustc_attr!(
rustc_nonnull_optimization_guaranteed, Normal, template!(Word), WarnFollowing,
EncodeCrossCrate::Yes,
"the `#[rustc_nonnull_optimization_guaranteed]` attribute is just used to enable \
niche optimizations in libcore and libstd and will never be stable",
"the `#[rustc_nonnull_optimization_guaranteed]` attribute is just used to document \
guaranteed niche optimizations in libcore and libstd and will never be stable\n\
(note that the compiler does not even check whether the type indeed is being non-null-optimized; \
it is your responsibility to ensure that the attribute is only used on types that are optimized)",
),
// ==========================================================================