Add issue 'nonlocal declaration not allowed at module level'

test/normalizer_issue_files/allowed_syntax.py

@@ -45,3 +45,7 @@ except:
     pass
 except ZeroDivisionError:
     pass
+
+
+class X():
+    nonlocal a

test/test_python_errors.py

@@ -105,6 +105,7 @@ def test_indentation_errors(code, positions):
         # SyntaxErrors from Python/symtable.c
         'def f(x, x): pass',
         'def x(): from math import *',
+        'nonlocal a',
 
         # IndentationError
         ' foo',