pub fn last_mut(&mut self) -> &mut T {
        match self.1.last_mut() {
            None => &mut self.0,
            Some(e) => e,
        }
    }
/// Get the last element mutably.
Get the last element mutably.
Get the last element mutably .
pub fn last_mut(&mut self) -> &mut T {
        match self.1.last_mut() {
            None => &mut self.0,
            Some(e) => e,
        }
    }
pub fn last_mut ( & mut self ) -> & mut T { match self . 1 . last_mut ( ) { None => & mut self . 0 , Some ( e ) => e , } }
Get the last element mutably.
Get the last element mutably .
&mut self
&mut self