Issue 14814: Remove dead function (noticed by Serhiy Storchaka)

Lib/ipaddress.py

@@ -183,24 +183,6 @@ def _find_address_range(addresses):
     return (first, last)
 
 
-def _get_prefix_length(number1, number2, bits):
-    """Get the number of leading bits that are same for two numbers.
-
-    Args:
-        number1: an integer.
-        number2: another integer.
-        bits: the maximum number of bits to compare.
-
-    Returns:
-        The number of leading bits that are the same for two numbers.
-
-    """
-    for i in range(bits):
-        if number1 >> i == number2 >> i:
-            return bits - i
-    return 0
-
-
 def _count_righthand_zero_bits(number, bits):
     """Count the number of zero bits on the right hand side.
 

Lib/test/test_ipaddress.py

@@ -551,7 +551,6 @@ class IpaddrUnitTest(unittest.TestCase):
             ipaddress.IPv4Address('10.10.10.10'),
             ipaddress.IPv4Address('10.10.10.12')])
         self.assertEqual(first, last)
-        self.assertEqual(0, ipaddress._get_prefix_length(2**32, 0, 32))
         self.assertEqual(128, ipaddress._count_righthand_zero_bits(0, 128))
         self.assertEqual("IPv4Network('1.2.3.0/24')", repr(self.ipv4_network))
         self.assertEqual('0x1020318', hex(self.ipv4_network))