| error[E0005]: refutable pattern in local binding | |
| --> $DIR/E0005.rs:3:9 | |
| | | |
| LL | let Some(y) = x; | |
| | ^^^^^^^ pattern `None` not covered | |
| | | |
| = note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant | |
| = note: for more information, visit https://doc.rust-lang.org/book/ch19-02-refutability.html | |
| = note: the matched value is of type `Option<i32>` | |
| help: you might want to use `let...else` to handle the variant that isn't matched | |
| | | |
| LL | let Some(y) = x else { todo!() }; | |
| | ++++++++++++++++ | |
| error: aborting due to 1 previous error | |
| For more information about this error, try `rustc --explain E0005`. |