1 error[E0283]: type annotations needed
2 --> $DIR/issue-85735.rs:7:8
5 | ^^^^^^^^^^^^^ cannot infer type for type parameter `T`
7 = note: cannot satisfy `T: FnMut<(&'a (),)>`
9 error: aborting due to previous error
11 For more information about this error, try `rustc --explain E0283`.