fix compiler crash on .pxd file processing

Cython/Compiler/CodeGeneration.py

@@ -3,7 +3,7 @@ from Cython.Compiler.ModuleNode import ModuleNode
 from Cython.Compiler.Nodes import *
 from Cython.Compiler.ExprNodes import *
 
-class ExtractPxdCode(CythonTransform):
+class ExtractPxdCode(VisitorTransform):
     """
     Finds nodes in a pxd file that should generate code, and
     returns them in a StatListNode.
@@ -28,3 +28,7 @@ class ExtractPxdCode(CythonTransform):
         # Do not visit children, nested funcdefnodes will
         # also be moved by this action...
         return node
+
+    def visit_Node(self, node):
+        self.visitchildren(node)
+        return node

Cython/Compiler/Pipeline.py

@@ -232,7 +232,7 @@ def create_pxd_pipeline(context, scope, module_name):
     return [
         parse_pxd_stage_factory(context, scope, module_name)
         ] + create_pipeline(context, 'pxd') + [
-        ExtractPxdCode(context)
+        ExtractPxdCode()
         ]
 
 def create_py_pipeline(context, options, result):