error[E0121]: the placeholder `_` is not allowed within types on item signatures for return types --> $DIR/suggest-fn-ptr-for-fn-item-in-fn-ret.rs:7:13 | LL | fn bar() -> _ { Wrapper(foo) } | ^ | | | not allowed in type signatures | help: replace with the correct return type: `Wrapper` error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0121`.