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error[E0277]: `?` couldn't convert the error to `()`
--> $DIR/issue-32709.rs:4:11
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LL | fn a() -> Result<i32, ()> {
| --------------- expected `()` because of this
LL | Err(5)?;
| ^ the trait `From<{integer}>` is not implemented for `()`
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= note: the question mark operation (`?`) implicitly performs a conversion on the error value using the `From` trait
= note: required by `from`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0277`.
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