Rollup merge of #67274 - RalfJung:uninit, r=Centril

be explicit that mem::uninitialized is the same as MaybeUninit::uninit().assume_init()

Cc @Centril @nikomatsakis

Author: Centril

src/libcore/mem/mod.rs

@@ -510,7 +510,9 @@ pub unsafe fn zeroed<T>() -> T {
 /// **This function is deprecated.** Use [`MaybeUninit<T>`] instead.
 ///
 /// The reason for deprecation is that the function basically cannot be used
-/// correctly: [the Rust compiler assumes][inv] that values are properly initialized.
+/// correctly: it has the same effect as [`MaybeUninit::uninit().assume_init()`][uninit].
+/// As the [`assume_init` documentation][assume_init] explains,
+/// [the Rust compiler assumes][inv] that values are properly initialized.
 /// As a consequence, calling e.g. `mem::uninitialized::<bool>()` causes immediate
 /// undefined behavior for returning a `bool` that is not definitely either `true`
 /// or `false`. Worse, truly uninitialized memory like what gets returned here
@@ -521,6 +523,8 @@ pub unsafe fn zeroed<T>() -> T {
 /// until they are, it is advisable to avoid them.)
 ///
 /// [`MaybeUninit<T>`]: union.MaybeUninit.html
+/// [uninit]: union.MaybeUninit.html#method.uninit
+/// [assume_init]: union.MaybeUninit.html#method.assume_init
 /// [inv]: union.MaybeUninit.html#initialization-invariant
 #[inline]
 #[rustc_deprecated(since = "1.39.0", reason = "use `mem::MaybeUninit` instead")]