1 error[E0308]: mismatched types
2 --> $DIR/closure-mismatch.rs:8:5
5 | ^^^ one type is more general than the other
7 = note: expected type `for<'r> std::ops::Fn<(&'r (),)>`
8 found type `std::ops::Fn<(&(),)>`
10 error: aborting due to previous error
12 For more information about this error, try `rustc --explain E0308`.