Fix a crasher where Python code managed to infinitely recurse in C code without
ever going back out to Python code in PyObject_Call(). Required introducing a
static RuntimeError instance so that normalizing an exception there is no
reliance on a recursive call that would put the exception system over the
recursion check itself.
diff --git a/Include/pyerrors.h b/Include/pyerrors.h
index ef7b252..a6ee840 100644
--- a/Include/pyerrors.h
+++ b/Include/pyerrors.h
@@ -161,6 +161,7 @@
#endif
PyAPI_DATA(PyObject *) PyExc_MemoryErrorInst;
+PyAPI_DATA(PyObject *) PyExc_RecursionErrorInst;
/* Predefined warning categories */
PyAPI_DATA(PyObject *) PyExc_Warning;