Function traitcast::cast_mut

pub fn cast_mut<'a, From: ?Sized, To: ?Sized>(
    x: &'a mut From
) -> Option<&'a mut To> where
    From: TraitcastFrom,
    To: 'static, 

Tries to cast the given mutable reference to a dynamic trait object. This will always return None if the implementation of the target trait, for the concrete type of x, has not been registered via traitcast!.