A function `as_borowed_mut` for pointers

1

I propose to add a new function as_borowed_mut that has a signature of as_borowed_mut<'a,T,U>( src:*mut ,from:&'a mut U) ->&'a mut T. This function as the existing function as_mut does but prevents the use of the original reference until the old one is dropped.

example:

let x:usize = 10;
let y = &mut x;
let z = as_borowed_mut(y as *mut usize,y);
*y; //fails because x is mutably borrowed by z
drop(z);
*y;//works
2

What is the benefit of this? And how will it be implemented?

3 
error: expected type, found `,`
 --> src/lib.rs:2:34
  |
2 | as_borowed_mut<'a,T,U>( src:*mut ,from:&'a mut U) ->&'a mut T
  |                                  ^ expected type
4

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