File: issue-100246.stderr

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error[E0308]: `?` operator has incompatible types
  --> $DIR/issue-100246.rs:28:24
   |
LL |     let other: Other = downcast()?;
   |                        ^^^^^^^^^^^ expected `Other`, found `&_`
   |
   = note: `?` operator cannot convert from `&_` to `Other`
   = note: expected struct `Other`
           found reference `&_`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0308`.