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do not accept [X|Xs] patterns as DCG non-terminals (#286)

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Mark Thom
2020-04-11 21:52:45 -06:00
parent 036c35729c
commit 92d8642133
1 changed files with 2 additions and 1 deletions
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src/prolog/lib/dcgs.pl
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@@ -107,7 +107,8 @@ 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, lists:append([T|Ts], S, S0)).
dcg_cbody([T|Ts], S0, S, Goal) :-
dcg_terminals([T|Ts], S0, S, Goal).
dcg_cbody(( GRFirst, GRSecond ), S0, S, ( First, Second )) :-
dcg_body(GRFirst, S0, S1, First),
dcg_body(GRSecond, S1, S, Second).