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Commit9f7100d

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Rollup merge ofrust-lang#127354 - nicholasbishop:bishop-sized-doc, r=Nilstrieb
Describe Sized requirements for mem::offset_ofThe container doesn't have to be sized, but the field must be sized (at least untilrust-lang#126151 is stable).
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‎core/src/mem/mod.rs‎

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@@ -1266,6 +1266,20 @@ impl<T> SizedTypeProperties for T {}
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/// // ^^^ error[E0616]: field `private` of struct `Struct` is private
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/// ```
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///
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/// Only [`Sized`] fields are supported, but the container may be unsized:
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/// ```
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/// # use core::mem;
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/// #[repr(C)]
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/// pub struct Struct {
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/// a: u8,
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/// b: [u8],
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/// }
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///
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/// assert_eq!(mem::offset_of!(Struct, a), 0); // OK
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/// // assert_eq!(mem::offset_of!(Struct, b), 1);
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/// // ^^^ error[E0277]: doesn't have a size known at compile-time
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/// ```
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///
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/// Note that type layout is, in general, [subject to change and
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/// platform-specific](https://doc.rust-lang.org/reference/type-layout.html). If
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/// layout stability is required, consider using an [explicit `repr` attribute].

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