1error[E0214]: parenthesized type parameters may only be used with a `Fn` trait 2 --> $DIR/unboxed-closure-sugar-used-on-struct-3.rs:14:13 3 | 4LL | let b = Bar::(isize, usize)::new(); // OK too (for the parser) 5 | ^^^^^^^^^^^^^^^^^^^ 6 | | 7 | only `Fn` traits may use parentheses 8 | help: use angle brackets instead: `Bar::<isize, usize>` 9 10error: aborting due to previous error 11 12For more information about this error, try `rustc --explain E0214`. 13