| error: expected one of `(`, `+`, `,`, `::`, `<`, or `{`, found `->` | |
| --> $DIR/issue-108109-fn-trait-missing-paren.rs:3:34 | |
| | | |
| LL | pub fn func<F>() where F: FnOnce -> () {} | |
| | -------^^ expected one of `(`, `+`, `,`, `::`, `<`, or `{` | |
| | | | | |
| | | help: try adding parentheses | |
| | `Fn` bounds require arguments in parentheses | |
| error: aborting due to 1 previous error | |