5.2.5 Predicates to support adapting code for double quoted strings
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Sourcecheck:string_predicate(:PredicateIndicator)
Declare that PredicateIndicator has clauses that contain strings, but that this is safe. For example, if there is a predicate help_info/2 , where the second argument contains a double quoted string that is handled properly by the predicates of the applications' help system, add the following declaration to stop list_strings/0 from complaining: 
:- multifile check:string_predicate/1.

check:string_predicate(user:help_info/2).
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