Add no binding found for nonlocal issue

test/normalizer_issue_files/allowed_syntax.py

@@ -47,13 +47,12 @@ except ZeroDivisionError:
     pass
 
 
-class X():
-    nonlocal a
-
-
 def c():
-    class X():
-        nonlocal a
+    a = 3
+
+    def d():
+        class X():
+            nonlocal a
 
 
 def x():

test/test_python_errors.py

@@ -175,10 +175,30 @@ FAILING_EXAMPLES = [
         '''),
     dedent('''
         def x():
-            global a
-            nonlocal a
+            a = 4
+            def y():
+                global a
+                nonlocal a
         '''),
     # Missing binding of nonlocal
+    dedent('''
+        def x():
+            nonlocal a
+        '''),
+    dedent('''
+        def x():
+            def y():
+                nonlocal a
+        '''),
+    dedent('''
+        def x():
+            a = 4
+            def y():
+                global a
+                print(a)
+                def z():
+                    nonlocal a
+        '''),