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% vim: ts=4 sw=4 et ft=mercury
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:- module app.
:- interface.
:- import_module io.

:- pred main(io__state::di, io__state::uo) is det.

:- implementation.
:- import_module list.

:- type foo(T)
    --->    append(T, T, T).

main -->
    { A = [1, 2, 3, 4, 5] },
    { B = [6, 7, 8] },
    { app(A, B, C) },
    io__write(app__append(A, B, C)),
    io__write_string(".\n"),
    { D = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5] },
    { E = [6, 7, 8] },
    { app(D, E, F) },
    io__write(app__append(D, E, F)),
    io__write_string(".\n").

:- pred app(list(T), list(T), list(T)).
:- mode app(in, in, out) is det.

app([], Bs, Bs).
app([A | As], Bs, [A | Cs]) :-
    app(As, Bs, Cs).