1 error[E0308]: try expression alternatives have incompatible types
2 --> $DIR/issue-51632-try-desugar-incompatible-types.rs:20:5
4 LL | missing_discourses()?
5 | ^^^^^^^^^^^^^^^^^^^^^
7 | expected enum `std::result::Result`, found isize
8 | help: try wrapping with a success variant: `Ok(missing_discourses()?)`
10 = note: expected type `std::result::Result<isize, ()>`
13 error: aborting due to previous error
15 For more information about this error, try `rustc --explain E0308`.