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https://github.com/Mercury-Language/mercury.git
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58 lines
1.3 KiB
Mathematica
58 lines
1.3 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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% The compiler would abort during liveness detection on an if-then-else goal
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% with an unreachable Then branch, due to the Then goal not having its
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% liveness-related fields initialised.
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:- module bug51.
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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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%---------------------------------------------------------------------------%
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%---------------------------------------------------------------------------%
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:- implementation.
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:- import_module list.
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:- type fruit
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---> apple
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; banana.
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main(!IO) :-
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my_map(make, [apple], Xs),
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do(Xs, !IO).
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:- pred my_map(pred(L, M), list(L), list(M)).
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:- mode my_map(pred(in, out) is det, in, out) is det.
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my_map(_, [], []).
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my_map(P, [H0 | T0], [H | T]) :-
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P(H0, H),
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my_map(P, T0, T).
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:- pred make(fruit::in, fruit::out) is det.
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make(X, X).
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:- pred do(list(fruit)::in, io::di, io::uo) is det.
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do([], !IO).
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do([X | Xs], !IO) :-
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( if Xs = [_ | _] then
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S = "1"
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else
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S = "2"
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),
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(
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X = apple
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;
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X = banana,
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io.write_string(S, !IO)
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).
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