1 error[E0005]: refutable pattern in local binding
2 --> $DIR/recursive-types-are-not-uninhabited.rs:6:9
5 | ^^^^^ pattern `Err(_)` not covered
7 = note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
8 = note: for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
9 = note: the matched value is of type `Result<u32, &R<'_>>`
10 help: you might want to use `let else` to handle the variant that isn't matched
12 LL | let Ok(x) = res else { todo!() };
15 error: aborting due to previous error
17 For more information about this error, try `rustc --explain E0005`.