// tgamma series directly.
const ex arg1_pt = arg1.subs(rel);
const ex arg2_pt = arg2.subs(rel);
- GINAC_ASSERT(is_exactly_a<symbol>(rel.lhs()));
+ GINAC_ASSERT(is_a<symbol>(rel.lhs()));
const symbol &s = ex_to<symbol>(rel.lhs());
ex arg1_ser, arg2_ser, arg1arg2_ser;
if ((!arg1_pt.info(info_flags::integer) || arg1_pt.info(info_flags::positive)) &&