| error[E0214]: parenthesized parameters may only be used with a trait | |
| --> $DIR/unboxed-closure-sugar-used-on-struct-1.rs:19:19 | |
| | | |
| LL | let x: Box<Bar()> = panic!(); | |
| | ^^ only traits may use parentheses | |
| error: aborting due to previous error | |
| For more information about this error, try `rustc --explain E0214`. |