added automaton to ast

src/passes.ml

@@ -19,6 +19,7 @@ let equation_pass f ast: t_nodelist option =
                         n_outputs      = node.n_outputs;
                         n_local_vars   = node.n_local_vars;
                         n_equations    = eqs;
+                        n_automata     = node.n_automata;
                         n_inputs_type  = node.n_inputs_type;
                         n_outputs_type = node.n_outputs_type;
                        }