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> {
17 = note: the matched value is of type `Option<i32>`
18 help: you might want to use `if let` to ignore the variant that isn't matched
20 LL | let y = if let Some(y) = x { y } else { todo!() };
21 | ++++++++++ ++++++++++++++++++++++
22 help: alternatively, on nightly, you might want to use `#![feature(let_else)]` to handle the variant that isn't matched
24 LL | let Some(y) = x else { todo!() };
27 error: aborting due to previous error
29 For more information about this error, try `rustc --explain E0005`.