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Rust suggests adding else to non-let assignment. #145548
Description
Code
fn main() {
let mut x = 1;
Some(x) = Some(1);
}Current output
error[E0005]: refutable pattern in local binding
--> src/main.rs:3:5
|
3 | Some(x) = Some(1);
| ^^^^^^^ 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/ch19-02-refutability.html
= note: the matched value is of type `Option<i32>`
help: you might want to use `let else` to handle the variant that isn't matched
|
3 | Some(x) = Some(1) else { todo!() };
| ++++++++++++++++
For more information about this error, try `rustc --explain E0005`.
error: could not compile `playground` (bin "playground") due to 1 previous errorDesired output
Rationale and extra context
Adding the else as suggested results in a parse error.
Other cases
Rust Version
Reproducible on the playground with version 1.91.0-nightly (2025-08-16 2e2642e641a941f0a140)Anything else?
No response
Activity