It looks like if let guards could help with flattening it in nightly but not in stable[1]: https://rust-lang.github.io/rfcs/2294-if-let-guard.html https://rust

It looks like if let guards could help with flattening it in nightly but not in stable[1]: https://rust-lang.github.io/rfcs/2294-if-let-guard.html https://rust-lang.github.io/rfcs/2294-if-let-guard.html [1] https://github.com/rust-lang/rust/issues/51114 https://github.com/rust-lang/rust/issues/51114