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42 lines
800 B
Mathematica
42 lines
800 B
Mathematica
%---------------------------------------------------------------------------%
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% vim: ts=4 sw=4 et ft=mercury
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%---------------------------------------------------------------------------%
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%
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% Compiling this module should generate an error message since
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% it tries to cast a non-standard func inst to ground.
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:- module ho_default_func_3.
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:- interface.
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:- import_module io.
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:- pred main(io::di, io::uo) is det.
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:- implementation.
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:- import_module int.
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:- import_module univ.
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main(!IO) :-
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baz(foo, F),
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io.write_int(F(42), !IO),
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io.nl(!IO).
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:- func foo(int) = int.
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foo(X) = X + 1.
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:- func bar(int) = int.
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:- mode bar(di) = uo is det.
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bar(X) = X.
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:- pred baz(T::in, T::out) is det.
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baz(X, Y) :-
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( if univ_to_type(univ(bar), Y0) then
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Y = Y0
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else
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Y = X
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).
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