error[E0308]: mismatched types --> $DIR/suggest-full-enum-variant-for-local-module.rs:9:28 | LL | let _: option::O<()> = (); | ------------- ^^ expected `O<()>`, found `()` | | | expected due to this | = note: expected enum `O<()>` found unit type `()` help: try wrapping the expression in `option::O::Some` | LL | let _: option::O<()> = option::O::Some(()); | ++++++++++++++++ + error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0308`.