Index: Python/marshal.c
===================================================================
--- Python/marshal.c	(revision 61058)
+++ Python/marshal.c	(working copy)
@@ -899,6 +899,7 @@
 			int nlocals;
 			int stacksize;
 			int flags;
+			int rc;
 			PyObject *code = NULL;
 			PyObject *consts = NULL;
 			PyObject *names = NULL;
@@ -946,6 +947,15 @@
 			if (lnotab == NULL)
 				goto code_error;
 
+			/* Conserve memory if possible. */
+			rc = PyObject_RichCompareBool(names, varnames, Py_EQ);
+			if (rc == 1) {
+				Py_DECREF(names);
+				names = varnames;
+				Py_INCREF(names);
+			} else if (rc == -1)
+				PyErr_Clear();
+
 			v = (PyObject *) PyCode_New(
 					argcount, nlocals, stacksize, flags,
 					code, consts, names, varnames,