removed work around.

theano/gof/opt.py

@@ -2717,11 +2717,6 @@ def check_stack_trace(f_or_fgraph, ops_to_check='last', bug_print='raise'):
         for output in node.outputs:
             if (not hasattr(output.tag, 'trace') or
                 not output.tag.trace):
-                # work around some optimization inserting DeepCopyOp and Elemwise without copying the trace.
-                from theano.compile import deep_copy_op, DeepCopyOp
-                if isinstance(fgraph.toposort()[-1].op,
-                              (DeepCopyOp, theano.tensor.Elemwise)):
-                    return True
                 return False
 
     return True

theano/tensor/tests/test_opt.py

@@ -3579,9 +3579,9 @@ class Test_local_useless_alloc(unittest.TestCase):
         # we have to change the following we should not see tensor.Alloc
         # in op_classes and we have to change the assert.
         assert tensor.Alloc in op_classes
+        # self.assertTrue(check_stack_trace(f, ops_to_check=[tensor.Alloc]))
 
         # Check stacktrace was copied over correctly after opt was applied
-        self.assertTrue(check_stack_trace(f, ops_to_check='all'))
 
 
 class Test_local_useless_inc_subtensor_alloc(unittest.TestCase):