Function closure_mut 

pub fn closure_mut<T, D>(data: D, f: fn(&mut D) -> T) -> ClosureMut<T, D>
where
    D: ThreadAware,

Constructs a ClosureMut.

Create a closure-like object by explicitly providing closed-over value and a function pointer to operate on that value, essentially simulating a parameterless closure that ensures that captured data implements ThreadAware.