troubleshoot windows failure

Author: jbrockmendel

pandas/core/indexes/base.py

@@ -114,7 +114,11 @@ def cmp_method(self, other):
 
         if is_bool_dtype(result):
             return result
-        return ops.invalid_comparison(self, other, op)
+        if is_scalar(result):
+            # Troubleshooting Windows errors
+            assert result is False, result
+            return ops.invalid_comparison(self, other, op)
+        raise RuntimeError(self.dtype, other, result)
 
     name = "__{name}__".format(name=op.__name__)
     return set_function_name(cmp_method, name, cls)