PEP 342 implementation. Per Guido's comments, the generator throw()

method still needs to support string exceptions, and allow None for the
third argument.  Documentation updates are needed, too.

Include/ceval.h

@@ -65,6 +65,7 @@ PyAPI_FUNC(char *) PyEval_GetFuncDesc(PyObject *);
 
 PyAPI_FUNC(PyObject *) PyEval_GetCallStats(PyObject *);
 PyAPI_FUNC(PyObject *) PyEval_EvalFrame(struct _frame *);
+PyAPI_FUNC(PyObject *) PyEval_EvalFrameEx(struct _frame *f, int exc);
 
 /* this used to be handled on a per-thread basis - now just two globals */
 PyAPI_DATA(volatile int) _Py_Ticker;

Include/graminit.h

@@ -76,3 +76,4 @@
 #define gen_if 331
 #define testlist1 332
 #define encoding_decl 333
+#define yield_expr 334

Include/pyerrors.h

@@ -25,6 +25,7 @@ PyAPI_FUNC(void) PyErr_NormalizeException(PyObject**, PyObject**, PyObject**);
 
 PyAPI_DATA(PyObject *) PyExc_Exception;
 PyAPI_DATA(PyObject *) PyExc_StopIteration;
+PyAPI_DATA(PyObject *) PyExc_GeneratorExit;
 PyAPI_DATA(PyObject *) PyExc_StandardError;
 PyAPI_DATA(PyObject *) PyExc_ArithmeticError;
 PyAPI_DATA(PyObject *) PyExc_LookupError;