add test for SyntaxError on

    def f(a):
        global a

Lib/test/test_compile.py

 from test_support import verbose, TestFailed
 
 if verbose:
-    print 'Running test on duplicate arguments'
+    print 'Running tests on argument handling'
 
 try:
     exec('def f(a, a): pass')
@@ -14,3 +14,9 @@ try:
     raise TestFailed, "duplicate keyword arguments"
 except SyntaxError:
     pass
+
+try:
+    exec('def f(a): global a; a = 1')
+    raise TestFailed, "variable is global and local"
+except SyntaxError:
+    pass