fix Py3 bug in test runner: setUp() stored view instead of list for later restore in tearDown()

runtests.py

@@ -637,12 +637,11 @@ class CythonCompileTestCase(unittest.TestCase):
 
     def setUp(self):
         from Cython.Compiler import Options
-        self._saved_options = [ (name, getattr(Options, name))
-                                for name in ('warning_errors',
-                                             'clear_to_none',
-                                             'error_on_unknown_names',
-                                             'error_on_uninitialized') ]
-        self._saved_default_directives = Options.directive_defaults.items()
+        self._saved_options = [
+            (name, getattr(Options, name))
+            for name in ('warning_errors', 'clear_to_none', 'error_on_unknown_names', 'error_on_uninitialized')
+        ]
+        self._saved_default_directives = list(Options.directive_defaults.items())
         Options.warning_errors = self.warning_errors
         if sys.version_info >= (3, 4):
             Options.directive_defaults['autotestdict'] = False