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A type with `packed` representation hint has a field with `align`
representation hint.
Erroneous code example:
```compile_fail,E0588
#[repr(align(16))]
struct Aligned(i32);
#[repr(packed)] // error!
struct Packed(Aligned);
```
Just like you cannot have both `align` and `packed` representation hints on the
same type, a `packed` type cannot contain another type with the `align`
representation hint. However, you can do the opposite:
```
#[repr(packed)]
struct Packed(i32);
#[repr(align(16))] // ok!
struct Aligned(Packed);
```
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