Issue 4910, patch 2 of (probably) 3: pave the way for renaming of
nb_long:  remove last remaining use of nb_long
(in the struct module) from the core, set nb_long slots on all builtin
and extension types to 0, and remove uses of __long__ in test_complex
and test_binop.

Reviewed by Benjamin Peterson.
diff --git a/Lib/test/test_binop.py b/Lib/test/test_binop.py
index f60fe3f..0dc18dd 100644
--- a/Lib/test/test_binop.py
+++ b/Lib/test/test_binop.py
@@ -77,12 +77,6 @@
                                       repr(self))
         raise ValueError("can't convert %s to int" % repr(self))
 
-    def __long__(self):
-        """Convert a Rat to an long; self.den must be 1."""
-        if self.__den == 1:
-            return int(self.__num)
-        raise ValueError("can't convert %s to long" % repr(self))
-
     def __add__(self, other):
         """Add two Rats, or a Rat and a number."""
         if isint(other):
diff --git a/Lib/test/test_cmath.py b/Lib/test/test_cmath.py
index 3c34fec..17cb566 100755
--- a/Lib/test/test_cmath.py
+++ b/Lib/test/test_cmath.py
@@ -182,11 +182,9 @@
             pass
         class MyInt(object):
             def __int__(self): return 2
-            def __long__(self): return 2
             def __index__(self): return 2
         class MyIntOS:
             def __int__(self): return 2
-            def __long__(self): return 2
             def __index__(self): return 2
 
         # other possible combinations of __float__ and __complex__
@@ -219,7 +217,7 @@
             self.assertEqual(f(JustFloatOS()), f(flt_arg))
             # TypeError should be raised for classes not providing
             # either __complex__ or __float__, even if they provide
-            # __int__, __long__ or __index__.  An old-style class
+            # __int__ or __index__.  An old-style class
             # currently raises AttributeError instead of a TypeError;
             # this could be considered a bug.
             self.assertRaises(TypeError, f, NeitherComplexNorFloat())