Using Rust Closures in Haskell

Rust closures look like lambdas in other languages. But they don't behave that way at all once you get anywhere past a trivial example. So for the rock Parser, I did it in like a parser combinator style in Rust. It worked fine up to a point. And then it was just like, you just can't do this anymore. That's not something in even in the language that's not designed for FP like JavaScript.