Backport generators to python < 2.5, use StopIteration instead of GeneratorExit.

Cython/Compiler/ExprNodes.py

@@ -8360,7 +8360,11 @@ static PyObject *__Pyx_Generator_Close(PyObject *self)
 {
     struct __pyx_Generator_object *generator = (struct __pyx_Generator_object *) self;
     PyObject *retval;
+#if PY_VERSION_HEX < 0x02050000
+    PyErr_SetNone(PyExc_StopIteration);
+#else
     PyErr_SetNone(PyExc_GeneratorExit);
+#endif
     retval = __Pyx_Generator_SendEx(generator, NULL);
     if (retval) {
         Py_DECREF(retval);
@@ -8368,8 +8372,12 @@ static PyObject *__Pyx_Generator_Close(PyObject *self)
                         "generator ignored GeneratorExit");
         return NULL;
     }
+#if PY_VERSION_HEX < 0x02050000
+    if (PyErr_ExceptionMatches(PyExc_StopIteration))
+#else
     if (PyErr_ExceptionMatches(PyExc_StopIteration)
         || PyErr_ExceptionMatches(PyExc_GeneratorExit))
+#endif
     {
         PyErr_Clear();          /* ignore these errors */
         Py_INCREF(Py_None);

runtests.py

@@ -62,7 +62,6 @@ VER_DEP_MODULES = {
                                           ]),
     (2,5) : (operator.lt, lambda x: x in ['run.any',
                                           'run.all',
-                                          'run.generators',
                                           ]),
     (2,6) : (operator.lt, lambda x: x in ['run.print_function',
                                           'run.cython3',

tests/run/generators.pyx

@@ -5,6 +5,11 @@ except ImportError:
     def next(it):
         return it.next()
 
+if hasattr(__builtins__, 'GeneratorExit'):
+    GeneratorExit = __builtins__.GeneratorExit
+else: # < 2.5
+    GeneratorExit = StopIteration
+
 def very_simple():
     """
     >>> x = very_simple()