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https://github.com/Mercury-Language/mercury.git
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1f6d83692a
tests/hard_coded/*.m:
Update programming style, unless doing so would change
the meaning of the test, in particular:
- use '.' as a module qualifier in place of '__'
- use {write,print}_line where appropriate
- use if-then-else in place of C -> T ; E
- use state variables in place of DCGs
tests/hard_coded/dir_test.m:
Document what the expected outputs correspond to.
Use a uniform module qualifier in the output.
tests/hard_coded/dir_test.exp*:
Conform to the above change.
59 lines
1.2 KiB
Mathematica
59 lines
1.2 KiB
Mathematica
%---------------------------------------------------------------------------%
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% vim: ts=4 sw=4 et ft=mercury
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%---------------------------------------------------------------------------%
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:- module unify_expression.
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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 require.
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:- import_module std_util.
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:- type t
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---> f(int, int)
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; g(t).
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main(!IO) :-
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( if p(g(f(1, 2)), X) then
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io.write_line(X, !IO)
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else
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io.write_string("Error: p failed\n", !IO)
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),
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( if q(1, 2) then
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io.print_line("Error: q succeeded", !IO)
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else
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io.print_line("q failed (as expected)", !IO)
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),
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( if r(1, 2) then
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io.print_line("Error: r succeeded", !IO)
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else
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io.print_line("r failed (as expected)", !IO)
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).
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:- pred p(t::in, t::out) is semidet.
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p(X @ f(_, _), X).
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p(g(X @ f(_, _)), X).
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:- pred q(int::in, int::in) is semidet.
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q(X, X @ g(_, _)).
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:- pred r(int::in, int::in) is semidet.
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r(X, X @ g(1, 2)).
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:- func g(int, int) = int.
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:- mode g(in, in) = out is semidet.
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:- mode g(out, out) = in is semidet.
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g(1, 2) = X :-
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( if semidet_succeed then
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error("g called")
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else
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X = 3
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).
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