Rust had generators first and used them to experiment with async. They're still there, stuck in nightly/unstable. https://doc.rust-lang.org/beta/unstable-book/

Rust had generators first and used them to experiment with async. They're still there, stuck in nightly/unstable. https://doc.rust-lang.org/beta/unstable-book/language-features/generators.html https://doc.rust-lang.org/beta/unstable-book/language-featur... I think that's because there was a huge demand for async specifically, and Rust could ship higher level async without solving all the design details of less desired generators first.