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error[E0005]: refutable pattern in local binding: `Err(_)` not covered
--> $DIR/feature-gate-exhaustive-patterns.rs:8:9
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LL | let Ok(_x) = foo();
| ^^^^^^ pattern `Err(_)` 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: `Result<u32, !>` defined here
--> $SRC_DIR/core/src/result.rs:LL:COL
|
LL | pub enum Result<T, E> {
| ---------------------
...
LL | Err(#[stable(feature = "rust1", since = "1.0.0")] E),
| ^^^ not covered
= note: the matched value is of type `Result<u32, !>`
help: you might want to use `if let` to ignore the variant that isn't matched
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LL | let _x = if let Ok(_x) = foo() { _x } else { todo!() };
| +++++++++++ +++++++++++++++++++++++
help: alternatively, you might want to use let else to handle the variant that isn't matched
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LL | let Ok(_x) = foo() else { todo!() };
| ++++++++++++++++
error: aborting due to previous error
For more information about this error, try `rustc --explain E0005`.
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