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Migrate pattern matching
[rust.git] / tests / ui / recursion / recursive-types-are-not-uninhabited.stderr
1 error[E0005]: refutable pattern in local binding
2   --> $DIR/recursive-types-are-not-uninhabited.rs:6:9
3    |
4 LL |     let Ok(x) = res;
5    |         ^^^^^ pattern `Err(_)` not covered
6    |
7    = note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
8    = note: for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
9    = note: the matched value is of type `Result<u32, &R<'_>>`
10 help: you might want to use `if let` to ignore the variant that isn't matched
11    |
12 LL |     let x = if let Ok(x) = res { x } else { todo!() };
13    |     ++++++++++                 ++++++++++++++++++++++
14 help: alternatively, you might want to use `let else` to handle the variant that isn't matched
15    |
16 LL |     let Ok(x) = res else { todo!() };
17    |                     ++++++++++++++++
18
19 error: aborting due to previous error
20
21 For more information about this error, try `rustc --explain E0005`.