main(!IO) :-
        io.write_string(X, !IO), io.nl(!IO),
        some_long_uninteresting_thing(X).

% this is the same:
main(!IO) :-
        some_long_uninteresting_thing(X),
        io.write_string(X, !IO), io.nl(!IO).

% but this is different!
main(!IO) :-
        io.nl(!IO), io.write_string(X, !IO),
        some_long_uninteresting_thing(X).