params_combine
p = params_combine(pp, p);
p = params_combine(pp, p);
p = params_combine(p, tp);
p = params_combine(p, tp);
p = params_combine(p, tp);
p = params_combine(p, inparams);
| rules rule { $$ = params_combine($$, $2); }
struct params *params_combine(struct params *, struct params *);