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doc: Document NonNull pointer ABI compatibility #157982

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doc: Document NonNull pointer ABI compatibility #157982

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4 changes: 4 additions & 0 deletions library/core/src/ptr/non_null.rs
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Expand Up @@ -49,6 +49,10 @@ use crate::{fmt, hash, intrinsics, mem, ptr};
///
/// # Representation
///
/// `NonNull<T>` is guaranteed to be ABI-compatible with `*const T`,
/// `*mut T`, `&T`, `&mut T`, and `Box<T, Global>` for all `T`, but its
/// pointer must not be null.
///
/// Thanks to the [null pointer optimization],
/// `NonNull<T>` and `Option<NonNull<T>>`
/// are guaranteed to have the same size and alignment:
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