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39 lines
1.1 KiB
Mathematica
39 lines
1.1 KiB
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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% This test ensures that functions can be declared with a determinism,
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% but without the modes. The compiler should give them the default
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% modes of `in' for the arguments and `out' for the return value.
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%
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% We test :- func definitions, lambda expressions and type class methods.
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:- module func_default_modes.
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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 list.
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:- func bar(int) = (int) is semidet.
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:- typeclass tc(T) where [
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func method1(T) = int is semidet
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].
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:- instance tc(int) where [
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func(method1/1) is bar
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].
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main(!IO) :-
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A = (func(X) = Y is semidet :- X = 4, Y = 7),
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B = (func(X) = (Y) is semidet :- Y = method1(X)),
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io.write_line(list.filter_map(A, [1, 2, 3, 4, 5, 6]), !IO),
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io.write_line(list.filter_map(bar, [1, 2, 3, 4, 5, 6]), !IO),
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io.write_line(list.filter_map(B, [1, 2, 3, 4, 5, 6]), !IO).
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bar(4) = 7.
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