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91e5e993a3
Estimated hours taken: 0.5 compiler/simplify.m Fix a bug in simplify.m where deconstructions were being propagated into lambda expressions, changing the non-locals of the lambda expression, but the uni-modes field of the lambda expression construction was not being updated. tests/valid/lambda_struct_bug.m Regression test.
48 lines
1.1 KiB
Mathematica
48 lines
1.1 KiB
Mathematica
% This is a regression test for a bug in simplify/common.m where
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% the pos(X, Y) deconstruction in the head of adj/2 was being propagated
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% into the body of the lambda expression, changing the non-locals of the
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% lambda expresssion, but the uni-modes field of the lambda construction
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% unification was not being updated, resulting in an abort during lambda
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% expansion.
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:- module lambda_struct_bug.
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:- interface.
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:- import_module list, std_util, set.
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:- type pos
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---> pos(int, int).
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:- type adj
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---> adj(pos, pos).
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:- type maze == set(pair(pos, pos)).
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:- pred adj(pos, list(adj)).
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:- mode adj(in, out) is det.
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:- implementation.
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:- import_module int, require.
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adj(pos(X, Y), Adjs) :-
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Pred = lambda([Adj::out] is nondet, (
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(
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X1 is X - 1,
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Adj = adj(pos(X1, Y), pos(X, Y))
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;
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X1 is X + 1,
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Adj = adj(pos(X1, Y), pos(X, Y))
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;
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Y1 is Y + 1,
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Adj = adj(pos(X, Y1), pos(X, Y))
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;
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Y1 is Y - 1,
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Adj = adj(pos(X, Y1), pos(X, Y))
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),
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Adj = adj(pos(A, B), _),
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A >= 0, A =< 10, % XXX
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B >= 0, B =< 10 % XXX
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)),
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solutions(Pred, Adjs).
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