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