error[E0308]: mismatched types
  --> $DIR/suggest-full-enum-variant-for-local-module.rs:9:28
   |
LL |     let _: option::O<()> = ();
   |            -------------   ^^
   |            |               |
   |            |               expected enum `O`, found `()`
   |            |               help: try using a variant of the expected enum: `option::O::Some(())`
   |            expected due to this
   |
   = note:   expected enum `O<()>`
           found unit type `()`

error: aborting due to previous error

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