luaS_eqstr
if (luaS_eqstr(label, ll->arr[i].name)) {
if (luaS_eqstr(up[i].name, name)) return i;
if (luaS_eqstr(n, getlocvar(fs, i)->varname))
lua_assert(luaS_eqstr(gt->name, label->name));
if (luaS_eqstr(lb->name, gt->name)) { /* correct label? */
if (luaS_eqstr(gl->arr[i].name, lb->name))
LUAI_FUNC int luaS_eqstr (TString *a, TString *b);