error[E0308]: mismatched types
  --> $DIR/issue-46112.rs:9:21
   |
LL | fn main() { test(Ok(())); }
   |                  -- ^^ expected `Option<()>`, found `()`
   |                  |
   |                  arguments to this enum variant are incorrect
   |
   = note:   expected enum `Option<()>`
           found unit type `()`
help: the type constructed contains `()` due to the type of the argument passed
  --> $DIR/issue-46112.rs:9:18
   |
LL | fn main() { test(Ok(())); }
   |                  ^^^--^
   |                     |
   |                     this argument influences the type of `Ok`
note: tuple variant defined here
  --> $SRC_DIR/core/src/result.rs:LL:COL
help: try wrapping the expression in `Some`
   |
LL | fn main() { test(Ok(Some(()))); }
   |                     +++++  +

error: aborting due to previous error

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