Remove unreachable

Author: dsaxton

pandas/_libs/interval.pyx

@@ -385,8 +385,6 @@ cdef class Interval(IntervalMixin):
     def __add__(self, y):
         if isinstance(y, (numbers.Number, Timedelta)):
             return Interval(self.left + y, self.right + y, closed=self.closed)
-        elif isinstance(y, Interval) and isinstance(self, numbers.Number):
-            return Interval(y.left + self, y.right + self, closed=y.closed)
         return NotImplemented
 
     def __sub__(self, y):
@@ -397,8 +395,6 @@ cdef class Interval(IntervalMixin):
     def __mul__(self, y):
         if isinstance(y, numbers.Number):
             return Interval(self.left * y, self.right * y, closed=self.closed)
-        elif isinstance(y, Interval) and isinstance(self, numbers.Number):
-            return Interval(y.left * self, y.right * self, closed=y.closed)
         return NotImplemented
 
     def __div__(self, y):