BufRead::fill_buf() is missing

I'm trying to read binary data from a `Read` with `BufReader`, but there is no `BufRead::fill_buf()` function, only `BufRead::poll_fill_buf()`. Looking back at the history, it seems the original `fill_buf()` was removed in commit edfa2358a42872af35024dd83e78ea80e8fe6a4a, by @stjepang (_"Re-export IO traits from futures"_ for version 0.99.7).

From the 0.99.7 release notes: _"io traits are now re-exports of futures-rs types, allowing them to be implemented"_; but that doesn't seem to imply any such removals, so is there something I'm missing?

For now I'm (trying to) implement my own future type for this, but do I need to / should I have to?
Any help would be greatly appreciated.