this post was submitted on 14 Feb 2024
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Neither does Haskell, and Haskell won't waste time doing something that doesn't matter.
Imagine using a linked list as your default sequential container.
Rust iterators are lazy btw.
You can't random-access an iterator and use it again later. Can Rust compute the value of calling a function an infinite number of times?
— former rustacean
If your specific use case really needs random access to a list while lazy computing the elements just wrap them in
Lazyand put them in a vector.The return type of an infinitely recursive function / infinite loops is ⊥, a type that by definition has no values. (Known in rust as
!)Haskell lets you infinitely recurse while still completing in finite time, and there's even a function (
fix) for that. Doing e.g.fix (+ 2)would be an infinite loop if evaluated, yes, butfix (2 :)would give you a useful value that's an infinite stream of 2s. (it's also useful for other things too)