1 error[E0005]: refutable pattern in local binding: `None` not covered
5 | ^^^^^^^ pattern `None` not covered
7 ::: $SRC_DIR/core/src/option.rs:LL:COL
12 = note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
13 = note: for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
14 = note: the matched value is of type `Option<i32>`
15 help: you might want to use `if let` to ignore the variant that isn't matched
17 LL | if let Some(y) = x { /* */ }
18 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
20 error: aborting due to previous error
22 For more information about this error, try `rustc --explain E0005`.