Guarantee that Layout::align returns a non-zero power of two

joshlf · web-flow · commit 25b81024a506 · 2023-09-07T12:54:34.000-07:00
diff --git a/library/core/src/alloc/layout.rs b/library/core/src/alloc/layout.rs
@@ -130,6 +130,8 @@ impl Layout {
     }
 
     /// The minimum byte alignment for a memory block of this layout.
+    ///
+    /// The returned alignment is guaranteed to be a non-zero power of two.
     #[stable(feature = "alloc_layout", since = "1.28.0")]
     #[rustc_const_stable(feature = "const_alloc_layout_size_align", since = "1.50.0")]
     #[must_use = "this returns the minimum alignment, \

Original file line number	Diff line number	Diff line change
`@@ -130,6 +130,8 @@ impl Layout {`
`130`	`130`	`}`
`131`	`131`
`132`	`132`	`/// The minimum byte alignment for a memory block of this layout.`
	`133`	`+ ///`
	`134`	`+ /// The returned alignment is guaranteed to be a non-zero power of two.`
`133`	`135`	`#[stable(feature = "alloc_layout", since = "1.28.0")]`
`134`	`136`	`#[rustc_const_stable(feature = "const_alloc_layout_size_align", since = "1.50.0")]`
`135`	`137`	`#[must_use = "this returns the minimum alignment, \`