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Rollup merge of #104081 - joshlf:patch-6, r=dtolnay 

PhantomData layout guarantees
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Matthias Krüger 2023-01-07 20:43:19 +01:00 committed by GitHub
parent 405e48f1ac 72a9029b84
commit 08653c8c57
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6
library/core/src/marker.rs
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@ -623,6 +623,12 @@ impl<T: ?Sized> !Sync for *mut T {}
/// (ideally) or `PhantomData<*const T>` (if no lifetime applies), so
/// as not to indicate ownership.
///
/// ## Layout
///
/// For all `T`, the following are guaranteed:
/// * `size_of::<PhantomData<T>>() == 0`
/// * `align_of::<PhantomData<T>>() == 1`
///
/// [drop check]: ../../nomicon/dropck.html
#[lang = "phantom_data"]
#[stable(feature = "rust1", since = "1.0.0")]