1 error[E0214]: parenthesized type parameters may only be used with a `Fn` trait
2 --> $DIR/unboxed-closure-sugar-used-on-struct.rs:7:15
4 LL | fn foo(b: Box<Bar()>) {
5 | ^^^^^ only `Fn` traits may use parentheses
7 error[E0107]: this struct takes 1 generic argument but 0 generic arguments were supplied
8 --> $DIR/unboxed-closure-sugar-used-on-struct.rs:7:15
10 LL | fn foo(b: Box<Bar()>) {
11 | ^^^ expected 1 generic argument
13 note: struct defined here, with 1 generic parameter: `A`
14 --> $DIR/unboxed-closure-sugar-used-on-struct.rs:3:8
18 help: add missing generic argument
20 LL | fn foo(b: Box<Bar(A)>) {
23 error: aborting due to 2 previous errors
25 Some errors have detailed explanations: E0107, E0214.
26 For more information about an error, try `rustc --explain E0107`.