error[E0308]: mismatched types --> $DIR/tag-that-dare-not-speak-its-name.rs:11:20 | LL | let x : char = last(y); | ---- ^^^^^^^ expected `char`, found `Option<_>` | | | expected due to this | = note: expected type `char` found enum `Option<_>` error: aborting due to previous error For more information about this error, try `rustc --explain E0308`.