diff -r a8f8ada7825c Modules/readline.c
--- a/Modules/readline.c	Fri Jun 12 16:48:30 2015 -0400
+++ b/Modules/readline.c	Fri Jun 12 19:53:32 2015 -0700
@@ -967,6 +967,9 @@
         Py_DECREF(r);
         goto done;
       error:
+        if (PyErr_Occurred()) {
+          PyErr_PrintEx(1);
+        }
         PyErr_Clear();
         Py_XDECREF(r);
       done: