`#[repr(transparent)]`은 크기가 0이 아닌 하나의 필드를 가지고 있는 (무량 필드는 더 있어도 됩니다) 구조체나 형이 하나인 열거형에만 쓰일 수 있습니다.
이것의 효과는 구조체/열거형의 전체 레이아웃과 ABI가 그 하나의 필드와 완전히 동일하도록 보장된다는 것입니다.
> 주의: `repr(transparent)`를 공용체에 적용하는 `transparent_unions` nightly 기능이 있지만,
> 디자인 문제 때문에 표준화되지 않았습니다. 더 자세한 내용은 [tracking issue][issue-60405]를 참고하세요.
`#[repr(transparent)]` can only be used on a struct or single-variant enum that has a single non-zero-sized field (there may be additional zero-sized fields).
The effect is that the layout and ABI of the whole struct/enum is guaranteed to be the same as that one field.
> NOTE: There's a `transparent_unions` nightly feature to apply `repr(transparent)` to unions,
> but it hasn't been stabilized due to design concerns. See the [tracking issue][issue-60405] for more details.
The goal is to make it possible to transmute between the single field and the
The goal is to make it possible to transmute between the single field and the
struct/enum. An example of that is [`UnsafeCell`], which can be transmuted into
struct/enum. An example of that is [`UnsafeCell`], which can be transmuted into