2 files changed, 8 insertions, 3 deletions
diff --git a/Objects/abstract.c b/Objects/abstract.c
index 6db8c26..f302281 100644
--- a/Objects/abstract.c
+++ b/Objects/abstract.c
@@ -2255,7 +2255,7 @@ _PyStack_AsTuple(PyObject **stack, Py_ssize_t nargs)
 }
 
 PyObject *
-_PyObject_FastCallDict(PyObject *func, PyObject **args, int nargs,
+_PyObject_FastCallDict(PyObject *func, PyObject **args, Py_ssize_t nargs,
                        PyObject *kwargs)
 {
     ternaryfunc call;
diff --git a/Objects/methodobject.c b/Objects/methodobject.c
index edb2fc0..394f1f4 100644
--- a/Objects/methodobject.c
+++ b/Objects/methodobject.c
@@ -146,15 +146,20 @@ PyCFunction_Call(PyObject *func, PyObject *args, PyObject *kwds)
 }
 
 PyObject *
-_PyCFunction_FastCallDict(PyObject *func_obj, PyObject **args, int nargs,
+_PyCFunction_FastCallDict(PyObject *func_obj, PyObject **args, Py_ssize_t nargs,
                           PyObject *kwargs)
 {
-    PyCFunctionObject* func = (PyCFunctionObject*)func_obj;
+    PyCFunctionObject *func = (PyCFunctionObject*)func_obj;
     PyCFunction meth = PyCFunction_GET_FUNCTION(func);
     PyObject *self = PyCFunction_GET_SELF(func);
     PyObject *result;
     int flags;
 
+    assert(func != NULL);
+    assert(nargs >= 0);
+    assert(nargs == 0 || args != NULL);
+    assert(kwargs == NULL || PyDict_Check(kwargs));
+
     /* _PyCFunction_FastCallDict() must not be called with an exception set,
        because it may clear it (directly or indirectly) and so the
        caller loses its exception */