1 error[E0271]: type mismatch resolving `<[closure@$DIR/issue-63279.rs:8:5: 8:28] as FnOnce<()>>::Output == ()`
2 --> $DIR/issue-63279.rs:5:16
4 LL | type Closure = impl FnOnce();
5 | ^^^^^^^^^^^^^ expected opaque type, found `()`
7 = note: expected opaque type `impl FnOnce<()>`
10 error: aborting due to previous error
12 For more information about this error, try `rustc --explain E0271`.