I won't argue with you on this particular example, but maybe the result (whether or not you run into these limitations) depends on how you approach the problem - point is I've seen (real world) Rust code on a project which looked and felt way more "FP" than procedural to me. But, it's more like I "dabbled" in Rust than that I could consider myself truly knowledgeable (let alone an expert) in it, I'm definitely not in a position to prove anything.
I won't argue with you on this particular example, but maybe the result (whether or not you run into these limitations) depends on how you approach the problem - point is I've seen (real world) Rust code on a project which looked and felt way more "FP" than procedural to me. But, it's more like I "dabbled" in Rust than that I could consider myself truly knowledgeable (let alone an expert) in it, I'm definitely not in a position to prove anything.
Some interesting points regarding whether or not Rust can be considered "functional":
fpcomplete.com/blog/2018/10/is-rus...