errors += fail_if_true( s, "insert foo existed" );
st_fetch( st, foo, class, 1 );
st_fetch( st, goo, class, 0 ); // st_fetch non existant
errors += fail_if_true( s, "insert foo existed" );
st_fetch( st, foo, class, 1 );
st_fetch( st, goo, class, 0 ); // st_fetch non existant