use round brackets for meta_predicate declarations
This is because meta_predicate is not a standard operator.
:- use_module(library(lists), [member/2]).
:- use_module(library(format), [format/3]).
-:- meta_predicate phrase_from_file(2, ?).
-:- meta_predicate phrase_from_file(2, ?, ?).
-:- meta_predicate phrase_to_file(2, ?).
+:- meta_predicate(phrase_from_file(2, ?)).
+:- meta_predicate(phrase_from_file(2, ?, ?)).
+:- meta_predicate(phrase_to_file(2, ?)).
phrase_from_file(NT, File) :-
phrase_from_file(NT, File, []).
