| @@ -1266,6 +1266,20 @@ impl SizedTypeProperties for T {} |
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| 1266 |
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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]. |