Clean up E0374 explanation
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A struct without a field containing an unsized type cannot implement
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`CoerceUnsized`. An [unsized type][1] is any type that the compiler
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doesn't know the length or alignment of at compile time. Any struct
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containing an unsized type is also unsized.
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[1]: https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait
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`CoerceUnsized` was implemented on a struct which does not contain a field with
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an unsized type.
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Example of erroneous code:
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@ -20,6 +16,12 @@ impl<T, U> CoerceUnsized<Foo<U>> for Foo<T>
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where T: CoerceUnsized<U> {}
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```
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An [unsized type][1] is any type where the compiler does not know the length or
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alignment of at compile time. Any struct containing an unsized type is also
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unsized.
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[1]: https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait
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`CoerceUnsized` is used to coerce one struct containing an unsized type
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into another struct containing a different unsized type. If the struct
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doesn't have any fields of unsized types then you don't need explicit
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