Fix problem with error raising in Scan perform.

theano/scan_module/scan_op.py

@@ -1115,15 +1115,16 @@ class Scan(PureOp):
                     # this is a new vm-provided function or c linker
                     # they need this because the exception manipulation
                     # done by raise_with_op is not implemented in C.
-                    if hasattr(self.fn, 'thunks'):
+                    if hasattr(fn, 'thunks'):
                         # For the CVM
-                        gof.link.raise_with_op(self.fn.nodes[self.fn.position_of_error],
-                                               self.fn.thunks[self.fn.position_of_error])
+                        gof.link.raise_with_op(fn.nodes[fn.position_of_error],
+                                               fn.thunks[fn.position_of_error])
                     else:
                         # For the c linker
-                        # We don't have access from python to all the temps values
-                        # So for now, we just don't print the extra shapes/strides info
-                        gof.vm.raise_with_op(self.fn.nodes[self.fn.position_of_error])
+                        # We don't have access from python to all the
+                        # temps values So for now, we just don't print
+                        # the extra shapes/strides info
+                        gof.vm.raise_with_op(fn.nodes[fn.position_of_error])
                 else:
                     # old-style linkers raise their own exceptions
                     raise