Rust is not vaporware under any reasonable definition of that word; there is plenty of Rust there to run. It is not stable yet, to be sure; but there are plenty of people happily using it, some even in production.

The person you replied to did not say that Rust is vaporware.

At worst, it says that Rust's toehold is tenuous enough that even vaporware could replace it. I don't agree with that, but I can understand the sentiment. Think "knocked back with a feather".

Why is that comment getting voted down? Everything it states is true.

Rust isn't stable. It really hasn't seen any serious use.

Even the Rust home page itself currently states, "Rust is a work-in-progress and may do anything it likes up to and including eating your laundry."

It's still in development, but it's a far cry from vaporware, and it's already being used in production at at least one company.

pekk isn't saying Rust is vaporware. The meaning of pekk's post seems to me to be "Since Rust is almost never used in production, outright vaporware would allow people to do the same thing they mostly do with Rust: not use it." In other words, Rust has not yet found a niche, so you can't supplant it in a niche it doesn't yet exist in.