mirror of
https://github.com/rust-lang/rust.git
synced 2024-12-04 20:54:13 +00:00
30 lines
1.1 KiB
Plaintext
30 lines
1.1 KiB
Plaintext
error[E0005]: refutable pattern in local binding: `None` not covered
|
|
--> $DIR/E0005.rs:3:9
|
|
|
|
|
LL | let Some(y) = x;
|
|
| ^^^^^^^ 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
|
|
note: `Option<i32>` defined here
|
|
--> $SRC_DIR/core/src/option.rs:LL:COL
|
|
|
|
|
LL | pub enum Option<T> {
|
|
| ------------------
|
|
...
|
|
LL | None,
|
|
| ^^^^ not covered
|
|
= 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
|
|
|
|
|
LL | let y = if let Some(y) = x { y } else { todo!() };
|
|
| ++++++++++ ++++++++++++++++++++++
|
|
help: alternatively, you might want to use let else to handle the variant that isn't matched
|
|
|
|
|
LL | let Some(y) = x else { todo!() };
|
|
| ++++++++++++++++
|
|
|
|
error: aborting due to previous error
|
|
|
|
For more information about this error, try `rustc --explain E0005`.
|