diff -r 135e1a8144ec Modules/_testcapimodule.c
--- a/Modules/_testcapimodule.c	Mon Jan 09 11:21:37 2017 +0100
+++ b/Modules/_testcapimodule.c	Tue Jan 10 12:39:29 2017 +0100
@@ -4039,6 +4039,15 @@ dict_get_version(PyObject *self, PyObjec
     return PyLong_FromUnsignedLongLong((unsigned PY_LONG_LONG)version);
 }
 
+static PyObject*
+stack_pointer(PyObject *self, PyObject *args)
+{
+    int v = 5;
+    Py_uintptr_t sp = (Py_uintptr_t)&v;
+
+    return PyLong_FromUnsignedLongLong(sp);
+}
+
 
 static PyMethodDef TestMethods[] = {
     {"raise_exception",         raise_exception,                 METH_VARARGS},
@@ -4244,6 +4253,7 @@ static PyMethodDef TestMethods[] = {
     {"tracemalloc_untrack", tracemalloc_untrack, METH_VARARGS},
     {"tracemalloc_get_traceback", tracemalloc_get_traceback, METH_VARARGS},
     {"dict_get_version", dict_get_version, METH_VARARGS},
+    {"stack_pointer", stack_pointer, METH_NOARGS},
     {NULL, NULL} /* sentinel */
 };