%---------------------------------------------------------------------------%
% vim: ts=4 sw=4 et ft=mercury
%---------------------------------------------------------------------------%
%
% XXX We issue a poor error message for this example.

:- module impure_func_t5_fixed.

:- interface.

:- import_module io.

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

:- implementation.

:- type foo
    --->    foo(impure func(int) = int).

:- pragma promise_pure(main/2).

main -->
    { Y = foo(get_counter) },
    { Y = foo(X) },
    print("X(4) = "),
    { X4 = impure_apply(X, 4) }, % missing `impure'
    print(X4),
    nl.

:- impure func get_counter(int) = int is det.

:- pragma foreign_decl("C", "extern MR_Integer counter;").
:- pragma foreign_code("C", "MR_Integer counter = 0;").
:- pragma foreign_proc("C",
    get_counter(Y::in) = (X::out),
    [will_not_call_mercury],
"
    X = counter + Y;
").

get_counter(X) = X.