SF Patch #494863, file.xreadlines() should raise ValueError if file is closed
This makes xreadlines behave like all other file methods
(other than close() which just returns).
diff --git a/Objects/fileobject.c b/Objects/fileobject.c
index 27612f4..9af5ca9 100644
--- a/Objects/fileobject.c
+++ b/Objects/fileobject.c
@@ -1025,6 +1025,8 @@
{
static PyObject* xreadlines_function = NULL;
+ if (f->f_fp == NULL)
+ return err_closed();
if (!xreadlines_function) {
PyObject *xreadlines_module =
PyImport_ImportModule("xreadlines");