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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
- |
- = 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`.