Issue #16592: stringlib_bytes_join doesn't raise MemoryError on allocation failure

Misc/NEWS

@@ -10,6 +10,9 @@ What's New in Python 3.4.0 Alpha 1?
 Core and Builtins
 -----------------
 
+- Issue #16592: stringlib_bytes_join doesn't raise MemoryError on allocation
+  failure.
+
 - Issue #16546: Fix: ast.YieldFrom argument is now mandatory.
 
 - Issue #16514: Fix regression causing a traceback when sys.path[0] is None

Objects/stringlib/join.h

@@ -43,6 +43,7 @@ STRINGLIB(bytes_join)(PyObject *sep, PyObject *iterable)
         buffers = PyMem_NEW(Py_buffer, seqlen);
         if (buffers == NULL) {
             Py_DECREF(seq);
+            PyErr_NoMemory();
             return NULL;
         }
     }