src/test/ui/recursion/recursive-types-are-not-uninhabited.stderr

   1 error[E0005]: refutable pattern in local binding: `Err(_)` not covered
   2   --> $DIR/recursive-types-are-not-uninhabited.rs:6:9
   3    |
   4 LL |     let Ok(x) = res;
   5    |         ^^^^^ pattern `Err(_)` not covered
   6    |
   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 help: you might want to use `if let` to ignore the variant that isn't matched
  10    |
  11 LL |     if let Ok(x) = res { /* */ }
  12    |
  13
  14 error: aborting due to previous error
  15
  16 For more information about this error, try `rustc --explain E0005`.