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Add a comment to justify why the pointer field is pub.

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Addresses https://github.com/rust-lang/rust/pull/93176/files#r795258110.
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Daniel Henry-Mantilla 2022-02-14 17:35:27 +01:00
parent c93968aee8
commit 002f627d38
1 changed files with 5 additions and 0 deletions
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library/core/src/pin.rs
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@ -406,6 +406,11 @@
#[repr(transparent)] #[repr(transparent)]
#[derive(Copy, Clone)] #[derive(Copy, Clone)]
pub struct Pin<P> { pub struct Pin<P> {
// FIXME(#93176): this field is made `#[unstable] #[doc(hidden)] pub` to:
// - deter downstream users from accessing it (which would be unsound!),
// - let the `pin!` macro access it (such a macro requires using struct
// literal syntax in order to benefit from lifetime extension).
// Long-term, `unsafe` fields or macro hygiene are expected to offer more robust alternatives.
#[unstable(feature = "unsafe_pin_internals", issue = "none")] #[unstable(feature = "unsafe_pin_internals", issue = "none")]
#[doc(hidden)] #[doc(hidden)]
pub pointer: P, pub pointer: P,