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error[E0308]: `?` operator has incompatible types
--> $DIR/issue-51632-try-desugar-incompatible-types.rs:8:5
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LL | missing_discourses()?
| ^^^^^^^^^^^^^^^^^^^^^ expected `Result<isize, ()>`, found `isize`
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= note: `?` operator cannot convert from `isize` to `Result<isize, ()>`
= note: expected enum `Result<isize, ()>`
found type `isize`
help: try removing this `?`
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LL - missing_discourses()?
LL + missing_discourses()
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help: try wrapping the expression in `Ok`
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LL | Ok(missing_discourses()?)
| +++ +
error: aborting due to previous error
For more information about this error, try `rustc --explain E0308`.
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