fix Py3-style class declarations after implementing extended PEP448 unpacking syntax

Cython/Compiler/Nodes.py

@@ -4157,9 +4157,11 @@ class OverrideCheckNode(StatNode):
         code.funcstate.release_temp(func_node_temp)
         code.putln("}")
 
+
 class ClassDefNode(StatNode, BlockNode):
     pass
 
+
 class PyClassDefNode(ClassDefNode):
     #  A Python class definition.
     #
@@ -4185,7 +4187,7 @@ class PyClassDefNode(ClassDefNode):
     mkw = None
 
     def __init__(self, pos, name, bases, doc, body, decorators=None,
-                 keyword_args=None, starstar_arg=None, force_py3_semantics=False):
+                 keyword_args=None, force_py3_semantics=False):
         StatNode.__init__(self, pos)
         self.name = name
         self.doc = doc
@@ -4200,10 +4202,11 @@ class PyClassDefNode(ClassDefNode):
             doc_node = None
 
         allow_py2_metaclass = not force_py3_semantics
-        if keyword_args or starstar_arg:
+        if keyword_args:
             allow_py2_metaclass = False
             self.is_py3_style_class = True
-            if keyword_args and not starstar_arg:
+            if keyword_args.is_dict_literal:
+                if keyword_args.key_value_pairs:
                     for i, item in list(enumerate(keyword_args.key_value_pairs))[::-1]:
                         if item.key.value == 'metaclass':
                             if self.metaclass is not None:
@@ -4213,18 +4216,16 @@ class PyClassDefNode(ClassDefNode):
                             # find metaclass" dance at runtime
                             self.metaclass = item.value
                             del keyword_args.key_value_pairs[i]
-            if starstar_arg:
-                self.mkw = ExprNodes.ProxyNode(ExprNodes.KeywordArgsNode(
-                    pos, keyword_args=keyword_args and keyword_args.key_value_pairs or [],
-                    starstar_arg=starstar_arg))
-            elif keyword_args.key_value_pairs:
                     self.mkw = keyword_args
                 else:
                     assert self.metaclass is not None
+            else:
+                # KeywordArgsNode
+                self.mkw = ExprNodes.ProxyNode(keyword_args)
 
         if force_py3_semantics or self.bases or self.mkw or self.metaclass:
             if self.metaclass is None:
-                if starstar_arg:
+                if keyword_args and not keyword_args.is_dict_literal:
                     # **kwargs may contain 'metaclass' arg
                     mkdict = self.mkw
                 else:

Cython/Compiler/Parsing.py

@@ -2996,7 +2996,6 @@ def p_class_statement(s, decorators):
     class_name.encoding = s.source_encoding  # FIXME: why is this needed?
     arg_tuple = None
     keyword_dict = None
-    starstar_arg = None
     if s.sy == '(':
         positional_args, keyword_args = p_call_parse_args(s, allow_genexp=False)
         arg_tuple, keyword_dict = p_call_build_packed_args(pos, positional_args, keyword_args)
@@ -3008,7 +3007,6 @@ def p_class_statement(s, decorators):
         pos, name=class_name,
         bases=arg_tuple,
         keyword_args=keyword_dict,
-        starstar_arg=starstar_arg,
         doc=doc, body=body, decorators=decorators,
         force_py3_semantics=s.context.language_level >= 3)