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Implement FusedIterator for DecodeUtf16 when the inner iterator does I have just implemented an iterator that wraps `DecodeUtf16` and wanted to implement `FusedIterator` for my iterator when I noticed that `DecodeUtf16` currently doesn't implement `FusedIterator` at all. A quick look at the code of `DecodeUtf16` revealed that `DecodeUtf16::next` only returns `None` when its inner iterator returns `None`: https://github.com/rust-lang/rust/blob/3462f79e94f466a56ddaccfcdd3a3d44dd1dda9f/library/core/src/char/decode.rs#L45 As a result, we can implement `FusedIterator` for `DecodeUtf16` when the inner iterator does. I'm following the example of #96397 here and consider this change minor and non-controversial, which is why I haven't added an RFC. I have also added the required feature name (`"decode_utf16_fused_iterator"`), however without adding a chapter to the Rust Unstable book (same as #96397).