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correct DCG descriptions of lists (#286)

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This commit is contained in:
Mark Thom
2020-03-14 14:14:26 -06:00
parent 31258247b3
commit 97aab6950c
2 changed files with 3 additions and 3 deletions
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src/prolog/lib/dcgs.pl
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@@ -107,8 +107,7 @@ dcg_constr((_->_)). % 7.14.12 - if-then (existence implementation dep.)
% The principal functor of the first argument indicates
% the construct to be expanded.
dcg_cbody([], S0, S, S0 = S).
dcg_cbody([T|Ts], S0, S, Goal) :-
dcg_terminals([T|Ts], S0, S, Goal).
dcg_cbody([T|Ts], S0, S, lists:append([T|Ts], S, S0)).
dcg_cbody(( GRFirst, GRSecond ), S0, S, ( First, Second )) :-
dcg_body(GRFirst, S0, S1, First),
dcg_body(GRSecond, S1, S, Second).