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71 lines
2.0 KiB
Mathematica
71 lines
2.0 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 is a regression test.
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%
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% The Mercury compiler of 26/10/1999 failed the first part of this test
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% (the part concerned with the implied mode of append).
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%
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% The Mercury compiler of 30/3/2000 failed the second part of this test
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% (the part with comparison_test1), due to overeager specialization of
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% comparisons involving ENUM_USEREQ types.
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%
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% The Mercury compiler still fails the third part of this test (the part
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% with comparison_test2) with --no-special-preds, because the exception
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% is not propagated across MR_call_engine properly. (It should work fine
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% with the default --special-preds.)
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:- module user_defined_equality.
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:- interface.
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:- import_module io.
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:- pred main(io::di, io::uo) is cc_multi.
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:- implementation.
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:- import_module list.
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:- import_module std_util.
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:- import_module exception.
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:- type foo
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---> bar
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; baz
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where equality is foo_equal.
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foo_equal(_, _) :-
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semidet_succeed.
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main(!IO) :-
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( if append([bar], [baz], [baz, bar]) then
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io.write_string("yes\n", !IO)
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else
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io.write_string("no\n", !IO)
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),
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perform_comparison_test(comparison_test1, !IO),
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perform_comparison_test(comparison_test2, !IO).
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:- pred perform_comparison_test(pred(T), io.state, io.state).
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:- mode perform_comparison_test(pred(out) is det, di, uo) is cc_multi.
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perform_comparison_test(Test, !IO) :-
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try(Test, TryResult),
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(
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TryResult = succeeded(Result),
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io.write_string("succeeded: ", !IO),
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io.write_line(Result, !IO)
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;
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TryResult = exception(Exception),
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io.write_string("threw exception: ", !IO),
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io.write_line(Exception, !IO)
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).
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:- pred comparison_test1(comparison_result::out) is det.
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comparison_test1(R) :-
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compare(R, bar, baz).
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:- pred comparison_test2(comparison_result::out) is det.
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comparison_test2(R) :-
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compare(R, [bar], [baz]).
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