DoubleLinkedList: pop

src/list.cr

@@ -243,7 +243,7 @@ class DoubleLinkedList(V)
 			if current = @first
 				@first = nil
 				@last = nil
-				return current.value
+				return current
 			else
 				raise BrokenList.new "pop a list of 1 element but 'first' is nil"
 			end
@@ -251,7 +251,8 @@ class DoubleLinkedList(V)
 
 		if last = @last
 			@last = last.previous
-			last.value
+			@last.not_nil!.next = nil
+			last
 		else
 			raise BrokenList.new "'last' element is nil despite size > 0"
 		end