void aig_exporter::collect_var_substs(substitution& subst, const app *h,
const expr_ref_vector& vars, expr_ref_vector& eqs) {
for (unsigned i = 0; i < h->get_num_args(); ++i) {
expr *arg = h->get_arg(i);
expr *latchvar = get_latch_var(i, vars);
if (is_var(arg)) {
var *v = to_var(arg);
expr_offset othervar;
if (subst.find(v, 0, othervar)) {
eqs.push_back(m.mk_eq(latchvar, othervar.get_expr()));
} else {
subst.insert(v, 0, expr_offset(latchvar, 0));
}
} else {
eqs.push_back(m.mk_eq(latchvar, arg));
}
}
}
static void assign(substitution & s, expr const & mvar, expr const & e) {
lean_assert(is_metavar(mvar));
s.insert(metavar_name(mvar), e);
}