Issue2221: in Idle, exec('xx') raised a SystemError('error return without exception set')

instead of the expected NameError

This happens when sys.stdout is redirected to something that cannot flush().
the flush_io() function must be exception-neutral: don't raise, and don't clear exceptions.

Next step: exec() is not supposed to flush sys.stdout...

1 files changed, 11 insertions, 0 deletions

diff --git a/Lib/test/test_builtin.py b/Lib/test/test_builtin.py
index 111090c..7244aff 100644
--- a/Lib/test/test_builtin.py
+++ b/Lib/test/test_builtin.py
@@ -448,6 +448,17 @@ class BuiltinTest(unittest.TestCase):
             del l['__builtins__']
         self.assertEqual((g, l), ({'a': 1}, {'b': 2}))
 
+    def test_exec_redirected(self):
+        savestdout = sys.stdout
+        sys.stdout = None # Whatever that cannot flush()
+        try:
+            # Used to raise SystemError('error return without exception set')
+            exec('a')
+        except NameError:
+            pass
+        finally:
+            sys.stdout = savestdout
+
     def test_filter(self):
         self.assertEqual(list(filter(lambda c: 'a' <= c <= 'z', 'Hello World')), list('elloorld'))
         self.assertEqual(list(filter(None, [1, 'hello', [], [3], '', None, 9, 0])), [1, 'hello', [3], 9])