Add regression test for future statements. This adds eight files, but

seven are not tests in their own right; these files are mentioned in
regrtest.

Lib/test/test_future4.py

@@ -0,0 +1,10 @@
+"""This is a test"""
+import __future__
+from __future__ import nested_scopes
+
+def f(x):
+    def g(y):
+        return x + y
+    return g
+
+print f(2)(4)