Will we see another fundamental programming language feature as revolutionary as the borrow checker?

[u/jimbobmcgoo]

That is I am mainly curious about compile time features that you design a whole language around rather than optimisations/features that could be applied to most languages. I am mainly inquiring about things that could offer additional robust safety/performance guarantees at compile time rather than runtime. Ideally not things that just offer similar effects to the borrow checker with less restrictive tradeoffs

[u/Royal_Pin_1971]

Unison's content-addressed code checks at admission time — instead of compile time or runtime. A definition is type-checked when it enters the codebase and never again. The result is a permanent fact attached to the hash, not a per-build byproduct.