Clean up

lbmpy/boundaries/boundaryhandling.py

@@ -52,11 +52,12 @@ class LatticeBoltzmannBoundaryHandling(BoundaryHandling):
         if boundary_obj not in self._boundary_object_to_boundary_info:
             sym_index_field = Field.create_generic('indexField', spatial_dimensions=1,
                                                    dtype=numpy_data_type_for_boundary_object(boundary_obj, self.dim))
-            kernels = [self._create_boundary_kernel(
-                self._data_handling.fields[self._field_name], sym_index_field, boundary_obj, Timestep.EVEN).compile(),
-                       self._create_boundary_kernel(
-                           self._data_handling.fields[self._field_name], sym_index_field, boundary_obj,
-                           Timestep.ODD).compile()]
+
+            ast_even = self._create_boundary_kernel(self._data_handling.fields[self._field_name], sym_index_field,
+                                                    boundary_obj, Timestep.EVEN)
+            ast_odd = self._create_boundary_kernel(self._data_handling.fields[self._field_name], sym_index_field,
+                                                   boundary_obj, Timestep.ODD)
+            kernels = [ast_even.compile(), ast_odd.compile()]
             if flag is None:
                 flag = self.flag_interface.reserve_next_flag()
             boundary_info = self.InplaceStreamingBoundaryInfo(self, boundary_obj, flag, kernels)