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fix: add aliasing rules for Box #146870

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Merged
rust-bors merged 1 commit into from
Apr 18, 2026
Merged

fix: add aliasing rules for Box #146870

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12 changes: 12 additions & 0 deletions library/alloc/src/boxed.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1268,6 +1268,7 @@ impl<T: ?Sized> Box<T> {
/// The raw pointer must point to a block of memory allocated by the global allocator.
///
/// The safety conditions are described in the [memory layout] section.
/// Note that the [considerations for unsafe code] apply to all `Box<T>` values.
///
/// # Examples
///
Expand All @@ -1293,6 +1294,7 @@ impl<T: ?Sized> Box<T> {
/// ```
///
/// [memory layout]: self#memory-layout
/// [considerations for unsafe code]: self#considerations-for-unsafe-code
#[stable(feature = "box_raw", since = "1.4.0")]
#[inline]
#[must_use = "call `drop(Box::from_raw(ptr))` if you intend to drop the `Box`"]
Expand All @@ -1317,6 +1319,7 @@ impl<T: ?Sized> Box<T> {
/// The non-null pointer must point to a block of memory allocated by the global allocator.
///
/// The safety conditions are described in the [memory layout] section.
/// Note that the [considerations for unsafe code] apply to all `Box<T>` values.
///
/// # Examples
///
Expand Down Expand Up @@ -1347,6 +1350,7 @@ impl<T: ?Sized> Box<T> {
/// ```
///
/// [memory layout]: self#memory-layout
/// [considerations for unsafe code]: self#considerations-for-unsafe-code
#[unstable(feature = "box_vec_non_null", issue = "130364")]
#[inline]
#[must_use = "call `drop(Box::from_non_null(ptr))` if you intend to drop the `Box`"]
Expand Down Expand Up @@ -1490,6 +1494,9 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
///
/// The raw pointer must point to a block of memory allocated by `alloc`.
///
/// The safety conditions are described in the [memory layout] section.
/// Note that the [considerations for unsafe code] apply to all `Box<T, A>` values.
///
/// # Examples
///
/// Recreate a `Box` which was previously converted to a raw pointer
Expand Down Expand Up @@ -1521,6 +1528,7 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
/// ```
///
/// [memory layout]: self#memory-layout
/// [considerations for unsafe code]: self#considerations-for-unsafe-code
#[unstable(feature = "allocator_api", issue = "32838")]
#[inline]
pub unsafe fn from_raw_in(raw: *mut T, alloc: A) -> Self {
Expand All @@ -1543,6 +1551,9 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
///
/// The non-null pointer must point to a block of memory allocated by `alloc`.
///
/// The safety conditions are described in the [memory layout] section.
/// Note that the [considerations for unsafe code] apply to all `Box<T, A>` values.
///
/// # Examples
///
/// Recreate a `Box` which was previously converted to a `NonNull` pointer
Expand Down Expand Up @@ -1573,6 +1584,7 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
/// ```
///
/// [memory layout]: self#memory-layout
/// [considerations for unsafe code]: self#considerations-for-unsafe-code
#[unstable(feature = "allocator_api", issue = "32838")]
// #[unstable(feature = "box_vec_non_null", issue = "130364")]
#[inline]
Expand Down
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