Python 3.x class bug using subclass fns

test/simple_source/def/07_classderef.py

@@ -0,0 +1,7 @@
+# From 3.4 ctypes/__init__.py
+# For opcode LOAD_CLASSDEREF
+
+def CFUNCTYPE(argtypes):
+    class CFunctionType(object):
+        _argtypes_ = argtypes
+    return CFunctionType

test/simple_source/def/11_classbug_subclass_fn.py

@@ -0,0 +1,5 @@
+# From python 3.4 endian.py
+# Bug was having two CALL_FUNCTION ops in bytecode.
+from ctypes import *
+class _swapped_meta(type(Structure)):
+    pass

uncompyle6/parsers/parse3.py

@@ -400,9 +400,11 @@ class Python3Parser(PythonParser):
                         call_function))
         self.add_unique_rule(rule, opname, token.attr, customize)
 
-        # Can the above build_class rule be folded into this rule?
+        # FIXME: What's the deal with the two rules? Different Python versions?
+        # Different situations? Note that the above rule is based on the CALL_FUNCTION
+        # token found, while this one doesn't.
         rule = ("build_class ::= LOAD_BUILD_CLASS mkfunc expr call_function "
-                "CALL_FUNCTION_" + str(args_pos+1))
+                "CALL_FUNCTION_3")
         self.add_unique_rule(rule, opname, token.attr, customize)
         return