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-rw-r--r--Include/bytesobject.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/Include/bytesobject.h b/Include/bytesobject.h
index bc385c1..9c1f4ba 100644
--- a/Include/bytesobject.h
+++ b/Include/bytesobject.h
@@ -41,8 +41,8 @@ PyAPI_FUNC(char *) PyBytes_AsString(PyObject *);
PyAPI_FUNC(int) PyBytes_Resize(PyObject *, Py_ssize_t);
/* Macros, trading safety for speed */
-#define PyBytes_AS_STRING(self) (((PyBytesObject *)(self))->ob_bytes)
-#define PyBytes_GET_SIZE(self) (((PyBytesObject *)(self))->ob_size)
+#define PyBytes_AS_STRING(self) (assert(PyBytes_Check(self)),((PyBytesObject *)(self))->ob_bytes)
+#define PyBytes_GET_SIZE(self) (assert(PyBytes_Check(self)),((PyBytesObject *)(self))->ob_size)
#ifdef __cplusplus
}