| $ cargo run |
| Compiling patterns v0.1.0 (file:///projects/patterns) |
| error[E0005]: refutable pattern in local binding: `None` not covered |
| --> src/main.rs:3:9 |
| | |
| 3 | let Some(x) = some_option_value; |
| | ^^^^^^^ 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/ch18-02-refutability.html |
| note: `Option<i32>` defined here |
| --> /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/core/src/option.rs:518:1 |
| | |
| = note: |
| /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/core/src/option.rs:522:5: not covered |
| = note: the matched value is of type `Option<i32>` |
| help: you might want to use `if let` to ignore the variant that isn't matched |
| | |
| 3 | let x = if let Some(x) = some_option_value { x } else { todo!() }; |
| | ++++++++++ ++++++++++++++++++++++ |
| help: alternatively, you might want to use let else to handle the variant that isn't matched |
| | |
| 3 | let Some(x) = some_option_value else { todo!() }; |
| | ++++++++++++++++ |
| |
| For more information about this error, try `rustc --explain E0005`. |
| error: could not compile `patterns` due to previous error |