I am not good at English. Sorry if there are any funny expressions.

std::vec::Splice does not implement FusedIterator. But Why?
This iterator generates the values to be deleted from the vector.
I wonder that the deletion targets of mutable-referenced collections don't appear later?

Now, I'm creating a custom type similar to Splice.
So, I need criteria for determining whether to mark it with FusedIterator.

I tried thinking about it myself as follows, but I hit a wall.
Vec<T>::splice method that returns a Splice is pretty complex...
The behavior of deletion and registration when dropping Splice is bit tricky.
Could that be the reason? Hmm..., I just don't get it.

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