--- a/Modules/_ctypes/ctypes.h	Thu Apr 24 18:07:05 2008 +0000
+++ b/Modules/_ctypes/ctypes.h	Thu Apr 24 18:14:19 2008 +0000
@@ -84,14 +84,18 @@
 };
 
 typedef struct {
+	PyObject_VAR_HEAD
 	ffi_closure *pcl; /* the C callable */
 	ffi_cif cif;
 	PyObject *converters;
 	PyObject *callable;
+	PyObject *restype;
 	SETFUNC setfunc;
-	ffi_type *restype;
+	ffi_type *ffi_restype;
 	ffi_type *atypes[1];
-} ffi_info;
+} CThunkObject;
+extern PyTypeObject CThunk_Type;
+#define CThunk_CheckExact(v)	    ((v)->ob_type == &CThunk_Type)
 
 typedef struct {
 	/* First part identical to tagCDataObject */
@@ -107,7 +111,7 @@
 	union value b_value;
 	/* end of tagCDataObject, additional fields follow */
 
-	ffi_info *thunk;
+	CThunkObject *thunk;
 	PyObject *callable;
 
 	/* These two fields will override the ones in the type's stgdict if
@@ -178,10 +182,10 @@
 
 extern PyMethodDef module_methods[];
 
-extern ffi_info *AllocFunctionCallback(PyObject *callable,
-				       PyObject *converters,
-				       PyObject *restype,
-				       int stdcall);
+extern CThunkObject *AllocFunctionCallback(PyObject *callable,
+					   PyObject *converters,
+					   PyObject *restype,
+					   int stdcall);
 /* a table entry describing a predefined ctypes type */
 struct fielddesc {
 	char code;