{"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"impl<'a,"}]}
impl<'a, T: PointeeSized + Unsize<U>, U: PointeeSized> DispatchFromDyn<&'a mut U> for &'a mut T {}
// &mut T -> &mut U
// *const T -> *const U