Where do you conclude "Rust promises I/O safety in the future"? An RFC is not a promise to do anything... it may represent a desire... a possibility, but you taking that leap and implying a promise is a flagrant misrepresentation.

Now let's take "the future" part... you seem to be impugning Async Rust for something it's not even purported to do in the present. What's the point of this?

You found a bug in monoio it seems... I don't see the argument you've presented as supporting the premise that "Async Rust is not safe".