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fix coerce unsized impl restriction #1935

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fix coerce unsized impl restriction #1935

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fix coerce unsized impl
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@lcnr
lcnr committed Jul 17, 2025
commit 79f2fd50b9c3df89f9fb62d23ed1ccfa68d24562
5 changes: 3 additions & 2 deletions src/type-coercions.md
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Expand Up @@ -221,8 +221,9 @@ r[coerce.unsized.composite]
* T is not part of the type of any other fields.

r[coerce.unsized.pointer]
Additionally, a type `Foo<T>` can implement `CoerceUnsized<Foo<U>>` when `T`
implements `Unsize<U>` or `CoerceUnsized<Foo<U>>`. This allows it to provide an
Additionally, a type `Foo<T>` can implement `CoerceUnsized<Foo<U>>` if there exists
exactly one non-`PhantomData` field which depends on the changed generic parameters
for which `Field<T>: CoerceUnsized<Field<U>>` holds. This allows it to provide an
unsized coercion to `Foo<U>`.

> [!NOTE]
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