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40 lines
1.1 KiB
Mathematica
40 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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:- module bug278.
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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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:- import_module map.
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main(!IO) :-
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io.write_string("Hello\n", !IO).
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:- type memo_table
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---> memo_table.
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:- pred build_map(pred(K, V, memo_table, memo_table), list(K), map(K, V),
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memo_table, memo_table).
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:- mode build_map(pred(in, out, in, out) is semidet, in, out, in, out) is det.
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build_map(KeyToValue, Keys, Map, !MemoTable) :-
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list.foldl2(
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% The bug is in the spelling of !:MemoTable1 here, it crashes the
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% compiler.
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( pred(K::in, !.M::in, !:M::out, !.MemoTable1::in, !:MemoTable::out)
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is det :-
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( if KeyToValue(K, V, !MemoTable1) then
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map.det_insert(K, V, !M)
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else
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true
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)
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), Keys, map.init, Map, !MemoTable).
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