1 error[E0005]: refutable pattern in local binding: `None` not covered
5 | ^^^^^^^ pattern `None` not covered
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 note: `Option<i32>` defined here
10 --> $SRC_DIR/core/src/option.rs:LL:COL
12 LL | / pub enum Option<T> {
14 LL | | #[lang = "None"]
15 LL | | #[stable(feature = "rust1", since = "1.0.0")]
19 LL | | Some(#[stable(feature = "rust1", since = "1.0.0")] T),
22 = note: the matched value is of type `Option<i32>`
23 help: you might want to use `if let` to ignore the variant that isn't matched
25 LL | if let Some(y) = x { /* */ }
26 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
28 error: aborting due to previous error
30 For more information about this error, try `rustc --explain E0005`.