1 error[E0308]: mismatched types
2 --> $DIR/issue-17033.rs:2:10
4 LL | (*p)(()) //~ ERROR mismatched types
7 | expected &mut (), found ()
8 | help: consider mutably borrowing here: `&mut ()`
10 = note: expected type `&mut ()`
13 error: aborting due to previous error
15 For more information about this error, try `rustc --explain E0308`.