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theano/scan_module/scan_op.py

@@ -207,7 +207,7 @@ class Scan(PureOp):
         if self.info['gpu'] or self.info['gpua']:
             self._hash_inner_graph = self.info['gpu_hash']
         else:
-            # gof don't know about SharedVariable. So add them as inputs.
+            # Do the missing inputs check here to have the error early.
             for var in theano.gof.graph.inputs(self.outputs, self.inputs):
                 if var not in self.inputs and not isinstance(var, theano.Constant):
                     raise theano.gof.MissingInputError("ScanOp is missing an input.")

theano/scan_module/tests/test_scan.py

@@ -4483,13 +4483,10 @@ class T_Scan(unittest.TestCase):
             return tensor.dot(x, w_)
 
         ret_strict = theano.scan(_scan_loose,
-                               sequences=[],
-                               outputs_info=[x0_],
-                               n_steps=n,
-                               strict=True)
-
-#        f_strict = theano.function([x0_], ret_strict[0][-1])
-#        result_strict = f_strict(x0)
+                                 sequences=[],
+                                 outputs_info=[x0_],
+                                 n_steps=n,
+                                 strict=True)
 
     def test_monitor_mode(self):
         # Test that it is possible to pass an instance of MonitorMode