let empty_env = { model_cardinal = 0; var_terms = Term.Set.empty; max_id_vars = 0; nb_vars = 0; perm_procs = []; perm_states = []; first_proc = 0; extra_proc = 0; all_procs = []; proc_ids = []; id_terms = HT.create 0; id_true = 0; id_false = 0; st_trs = []; low_int_abstr = 0; up_int_abstr = 0; pinf_int_abstr = 0; minf_int_abstr = 0; proc_substates = HLI.create 0; reverse_proc_substates = HI.create 0; partial_order = []; table_size = 0; explicit_states = HST.create 0; states = []; }