[randomstringxyz]

Conceptually, think about it. Coroutines require copying not only the variables but the function itself, outside of the lifetime of the parent function. (Or at least pointers thereto.) I would like to hear about a language with static coroutines but I am not aware of any. Even Rust doesn't do it, they just make you pass the lifetime around.

[kibwen]

The parent is talking about closures, not coroutines. Rust does have closures that don't require a GC or passing lifetimes around (there's not even any syntax for putting a lifetime on a closure).

[thayne]

Rust closures can have lifetimes, and the lifetime of a closure is restricted to the lifetime of the shortest lived reference that it captures. But that just means the compiler protects you from having dangling pointers in your closure. And I don't think you can get much better than that without a runtime garbage collector.

[kibwen]

A Rust closure "has" a lifetime in the sense that the anonymous underlying struct that Rust creates to hold the closed-over values has a lifetime, but that's not a requirement to have closures without a GC. Like C++, Odin doesn't care about being memory-safe, so you can just say "be careful doing anything that involves pointers" (which is how the language already works), or if you wanted to be a little safer you could just forbid closing over anything that contained a pointer.