BufRead::fill_buf() is missing

[gtsiam]

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 edfa235, 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.

[taiki-e]

Looking back at the history, it seems the original fill_buf() was removed in commit edfa235

removed because unsound.

[gtsiam]

Could you explain what you mean by unsound? I'll admit I'm relatively new to Rust.

[taiki-e]

removed because unsound.

I mean "original fill_buf implementation (#176) has a soundness hole (worst kind of bug)" (I'm sorry if the comment was difficult to understand.)

See #176 (comment) for details on the bug.