transaction_obs_pkg
op = transaction_obs_pkg(trans, p);
s2 = pool->solvables + transaction_obs_pkg(trans, p);
p2 = transaction_obs_pkg(trans, p);
q = transaction_obs_pkg(trans, p);
if (transaction_obs_pkg(trans, q) == p)
else if (transaction_obs_pkg(trans, q) == p)
q = transaction_obs_pkg(trans, p);
q = transaction_obs_pkg(trans, p);
extern Id transaction_obs_pkg(Transaction *trans, Id p);