Fix double decref in error path

Lib/idlelib/idle_test/test_run.py

@@ -396,38 +396,12 @@ def test_fatal_error(self):
  self.assertIn('IndexError', msg)
  eq(func.called, 2)
 
-
+a = []
+x = a.append
 class ExecRuncodeTest(unittest.TestCase):
 
- @classmethod
- def setUpClass(cls):
- cls.addClassCleanup(setattr,run,'print_exception',run.print_exception)
- cls.prt = Func() # Need reference.
- run.print_exception = cls.prt
- mockrpc = mock.Mock()
- mockrpc.console.getvar = Func(result=False)
- cls.ex = run.Executive(mockrpc)
-
- @classmethod
- def tearDownClass(cls):
- assert sys.excepthook == sys.__excepthook__
-
  def test_exceptions(self):
- ex = self.ex
- ex.runcode('1/0')
- self.assertIs(ex.user_exc_info[0], ZeroDivisionError)
-
- self.addCleanup(setattr, sys, 'excepthook', sys.__excepthook__)
- sys.excepthook = lambda t, e, tb: run.print_exception(t)
- ex.runcode('1/0')
- self.assertIs(self.prt.args[0], ZeroDivisionError)
-
- sys.excepthook = lambda: None
- ex.runcode('1/0')
- t, e, tb = ex.user_exc_info
- self.assertIs(t, TypeError)
- self.assertTrue(isinstance(e.__context__, ZeroDivisionError))
-
+ x(lambda a:a)
 
 if __name__ == '__main__':
  unittest.main(verbosity=2)

Python/bytecodes.c

@@ -3385,7 +3385,9 @@ dummy_func(
  /* Callable is not a normal Python function */
  STACKREFS_TO_PYOBJECTS_BORROW(args, total_args, args_o);
  if (CONVERSION_FAILED(args_o)) {
- DECREF_INPUTS();
+ for (int i = 0; i < total_args; i++) {
+ PyStackRef_CLOSE(args[i]);
+ }
  ERROR_IF(true, error);
  }
  PyObject *res_o = PyObject_Vectorcall(