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error[E0005]: refutable pattern in local binding: `None` not covered
--> $DIR/E0005.rs:3:9
|
LL | let Some(y) = x;
| ^^^^^^^ pattern `None` not covered
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= 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
--> $SRC_DIR/core/src/option.rs:LL:COL
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LL | / pub enum Option<T> {
LL | | /// No value.
LL | | #[lang = "None"]
LL | | #[stable(feature = "rust1", since = "1.0.0")]
LL | | None,
| | ^^^^ not covered
... |
LL | | Some(#[stable(feature = "rust1", since = "1.0.0")] T),
LL | | }
| |_-
= 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
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LL | let y = if let Some(y) = x { y } else { todo!() };
| ++++++++++ ++++++++++++++++++++++
help: alternatively, on nightly, you might want to use `#![feature(let_else)]` to handle the variant that isn't matched
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LL | let Some(y) = x else { todo!() };
| ++++++++++++++++
error: aborting due to previous error
For more information about this error, try `rustc --explain E0005`.
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