Added a closure test that would have failed before the names_dict refactoring.

test/completion/ordering.py

@@ -89,6 +89,22 @@ def f(b, a): return a
 #? []
 f(b=3)
 
+# -----------------
+# closure
+# -----------------
+
+def x():
+    a = 0
+
+    def x():
+        return a
+
+    a = 3.0
+    return x()
+
+#? float()
+x()
+
 # -----------------
 # class
 # -----------------