Re: [PATCH v2] rust: Implement the smart pointer `InPlaceInit` for `Arc`

[Valentin Obst]

[snip]

> @@ -1112,11 +1113,15 @@ unsafe fn __pinned_init(self, slot: *mut T) -> Result<(), E> {
>
>  /// Smart pointer that can initialize memory in-place.
>  pub trait InPlaceInit<T>: Sized {
> +    /// A type might be pinned implicitly. An addtional `Pin<ImplicitlyPinned>` is useless. In
> +    /// doubt, the type can just be set to `Pin<Self>`.
> +    type PinnedResult;
> +

[snip]

nit: Typo 's/addtional/additional'

Apart from that, I think "When in doubt, ..." or "If in doubt, ..." are
more common choices than "In doubt, ...". But that's a question of style so
feel free to ignore this comment.

Rest looks good to me.

	Best
	Valentin