Add test case as pickled arguments to theano.function

theano/tensor/tests/test_opt.py

@@ -2,6 +2,8 @@
 
 import copy
 import logging
+import pickle
+import os
 import time
 import unittest
 
@@ -2645,6 +2647,13 @@ class test_shapeoptimizer(unittest.TestCase):
         f = theano.function([X], expr, mode=mode)
         print f([[1, 2], [2, 3]])
 
+    def test_no_cycle(self):
+        # Optimizing this graph resulted in a cycle, see gh-1549
+        pkl_filename = os.path.join(os.path.dirname(theano.__file__),
+                                    'tensor', 'tests', 'shape_opt_cycle.pkl')
+        fn_args = pickle.load(open(pkl_filename, "rb"))
+        theano.function(**fn_args)
+
 
 class test_assert(utt.InferShapeTester):