Makes you wonder why no-one else came up with that idea before. I mean, it is pretty revolutionary, but also really obvious in hindsight.

I'm curious why this is seen as a new idea. The capability to pull it off is somewhat new. In particular, at such a large scale.

But the idea is far from it. Commercial compilers probably had this more than open source ones in the past. Though, oddly, it was probably a weakness in some respects, since it almost certainly slowed feature development/releases.

Crates.io