:- module func_errors.

:- interface.
:- import_module int.

% it is an error to declare determinism but not modes,
% or to only declare some of the modes

:- func foo(int, int) = int is semidet.
:- func bar(int::in, int) = int is semidet.
:- func baz(int::in, int::in) = int is semidet.
:- func quux(int, int) = (int::out) is semidet.

:- func ok(int::in, int::in) = (int::out) is semidet.

:- pred p(int, int) is semidet.
:- mode p(in, in) is semidet.
:- pred q(int::in, int) is semidet.

:- implementation.

% foo(X, Y) = X + Y :- X > 0.
% bar(X, Y) = X + Y :- X > 0.
% baz(X, Y) = X + Y :- X > 0.
% quux(X, Y) = X + Y :- X > 0.

p(X, Y) :- X > Y.
% q(X, Y) :- X > Y.

ok(X, Y) = X + Y :- X > 0.