ignore 'raise ... from None' in Py<3.3

diff --git a/Cython/Utility/Exceptions.c b/Cython/Utility/Exceptions.c
index 2c11287..9f3d53a 100644 (file)
--- a/Cython/Utility/Exceptions.c
+++ b/Cython/Utility/Exceptions.c
@@ -186,7 +186,11 @@ static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb, PyObject
         goto bad;
     }
 
+#if PY_VERSION_HEX >= 0x03030000
     if (cause) {
+#else
+    if (cause && cause != Py_None) {
+#endif
         PyObject *fixed_cause;
         if (cause == Py_None) {
             /* raise ... from None */