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docs: add link explaining variance to NonNull docs #96674

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May 10, 2022
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docs: add link explaining variance to NonNull docs #96674

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3 changes: 2 additions & 1 deletion library/core/src/ptr/non_null.rs
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Expand Up @@ -9,7 +9,7 @@ use crate::ops::{CoerceUnsized, DispatchFromDyn};
use crate::ptr::Unique;
use crate::slice::{self, SliceIndex};

/// `*mut T` but non-zero and covariant.
/// `*mut T` but non-zero and [covariant].
///
/// This is often the correct thing to use when building data structures using
/// raw pointers, but is ultimately more dangerous to use because of its additional
Expand Down Expand Up @@ -42,6 +42,7 @@ use crate::slice::{self, SliceIndex};
/// it is your responsibility to ensure that `as_mut` is never called, and `as_ptr`
/// is never used for mutation.
///
/// [covariant]: https://doc.rust-lang.org/reference/subtyping.html
/// [`PhantomData`]: crate::marker::PhantomData
/// [`UnsafeCell<T>`]: crate::cell::UnsafeCell
#[stable(feature = "nonnull", since = "1.25.0")]
Expand Down