added test case for fixed duplicate arguments bug in Python/compile.c

Lib/test/output/test_compile

+test_compile

Lib/test/test_compile.py

+from test_support import verbose, TestFailed
+
+if verbose:
+    print 'Running test on duplicate arguments'
+
+try:
+    exec('def f(a, a): pass')
+    raise TestFailed, "duplicate arguments"
+except SyntaxError:
+    pass
+
+try:
+    exec('def f(a = 0, a = 1): pass')
+    raise TestFailed, "duplicate keyword arguments"
+except SyntaxError:
+    pass