$ 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
help: you might want to use `if let` to ignore the variant that isn't matched
  |
3 |     if let Some(x) = some_option_value { /* */ }
  |

error: aborting due to previous error

For more information about this error, try `rustc --explain E0005`.
error: could not compile `patterns`.

To learn more, run the command again with --verbose.
