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Modify infer_meta_predicate/2 such that ? is reported rather than * #897

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Modify infer_meta_predicate/2 such that ? is reported rather than * #897

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9 changes: 5 additions & 4 deletions library/prolog_metainference.pl
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Original file line number Diff line number Diff line change
Expand Up @@ -78,8 +78,9 @@
%! infer_meta_predicate(:Head, -MetaSpec) is semidet
%
% True when MetaSpec is a meta-predicate specifier for the
% predicate Head. Derived meta-predicates are collected and made
% available through inferred_meta_predicate/2.
% predicate Head following the same format as meta_predicate/1.
% Derived meta-predicates are collected and made available
% through inferred_meta_predicate/2.

infer_meta_predicate(Head, MetaSpec) :-
inferred_meta_predicate(Head, MetaSpec),
Expand Down Expand Up @@ -228,7 +229,7 @@
-> C = B
; is_meta(A), is_meta(B)
-> C = (:)
; C = *
; C = ?
).

attr_unify_hook(A0, Other) :-
Expand Down Expand Up @@ -286,7 +287,7 @@
HeadArg = M:_,
get_attr(M, prolog_metainference, m),
!.
meta_arg(_, *).
meta_arg(_, ?).

%! combine_meta_args(+Heads, -Head) is det.
%
Expand Down