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docs: add link explaining variance to NonNull docs

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bstrie 2022-05-03 11:57:24 -04:00
parent e1df625306
commit 6096cfbfff
1 changed files with 2 additions and 1 deletions
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3
library/core/src/ptr/non_null.rs
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@ -9,7 +9,7 @@ use crate::ops::{CoerceUnsized, DispatchFromDyn};
use crate::ptr::Unique; use crate::ptr::Unique;
use crate::slice::{self, SliceIndex}; 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 /// 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 /// raw pointers, but is ultimately more dangerous to use because of its additional
@ -42,6 +42,7 @@ use crate::slice::{self, SliceIndex};
/// it is your responsibility to ensure that `as_mut` is never called, and `as_ptr` /// it is your responsibility to ensure that `as_mut` is never called, and `as_ptr`
/// is never used for mutation. /// is never used for mutation.
/// ///
/// [covariant]: https://doc.rust-lang.org/reference/subtyping.html
/// [`PhantomData`]: crate::marker::PhantomData /// [`PhantomData`]: crate::marker::PhantomData
/// [`UnsafeCell<T>`]: crate::cell::UnsafeCell /// [`UnsafeCell<T>`]: crate::cell::UnsafeCell
#[stable(feature = "nonnull", since = "1.25.0")] #[stable(feature = "nonnull", since = "1.25.0")]