pub fn or_insert_with<F: FnOnce() -> V>(self, with: F) -> &'a mut V
    {
	match self {
	    Entry::Occupied(o) => o.into_mut(),
	    Entry::Vacant(v) => v.insert(with())
	}
    }
/// Insert into the entry if it is empty the value returned by the closure and return a mutable reference to the new value, otherwise return a mutable reference to the already present value.
Insert into the entry if it is empty the value returned by the closure and return a mutable reference to the new value, otherwise return a mutable reference to the already present value.
Insert into the entry if it is empty the value returned by the closure and return a mutable reference to the new value otherwise return a mutable reference to the already present value .
pub fn or_insert_with<F: FnOnce() -> V>(self, with: F) -> &'a mut V
    {
	match self {
	    Entry::Occupied(o) => o.into_mut(),
	    Entry::Vacant(v) => v.insert(with())
	}
    }
pub fn or_insert_with < F : FnOnce ( ) -> V > ( self , with : F ) -> & ' a mut V { match self { Entry :: Occupied ( o ) => o . into_mut ( ) , Entry :: Vacant ( v ) => v . insert ( with ( ) ) } }
Insert into the entry if it is empty the value returned by the closure and return a mutable reference to the new value, otherwise return a mutable reference to the already present value.
Insert into the entry if it is empty the value returned by the closure and return a mutable reference to the new value otherwise return a mutable reference to the already present value .
self
with
F