repair compiler crash due to attribute error

Cython/Compiler/Nodes.py

@@ -197,6 +197,7 @@ class Node(object):
     is_nonecheck = 0
     is_literal = 0
     is_terminator = 0
+    is_wrapper = False  # is a DefNode wrapper for a C function
     temps = None
 
     # All descendants should set child_attrs to a list of the attributes
@@ -1616,7 +1617,6 @@ class FuncDefNode(StatNode, BlockNode):
     needs_closure = False
     needs_outer_scope = False
     pymethdef_required = False
-    is_wrapper = False
     is_generator = False
     is_generator_body = False
     is_async_def = False

Cython/Compiler/ParseTreeTransforms.py

@@ -1697,7 +1697,7 @@ if VALUE is not None:
     def visit_DefNode(self, node):
         node = self.visit_FuncDefNode(node)
         env = self.current_env()
-        if node.is_wrapper:
+        if isinstance(node, Nodes.DefNode) and node.is_wrapper:
             env = env.parent_scope
         if (not isinstance(node, Nodes.DefNode) or
                 node.fused_py_func or node.is_generator_body or