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Add future possibility of implementing `FusedIterator` 

The main body of the RFC discusses how we might implement
`FusedIterator` for the iterators produced by `gen` blocks, but this
was not listed as a future possibility.  Let's do that.
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@ -687,3 +687,7 @@ gen fn foo(args) // or any of the above variants for the item type
gen foo(args) // or any of the above variants for the item type
generator fn foo(args) // or any of the above variants for the item type
```
## Implement `FusedIterator`
The iterators produced by `gen` blocks are fused but do not implement `FusedIterator` because it is not a language item. We may in the future want for these iterators to implement `FusedIterator`.