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$ cd JSON-Parse-0.40 $ grep -r "warn_only" * ... json-common.c: unsigned int warn_only : 1; json-entry-points.c: parser_o.warn_only = 1; lib/JSON/Parse.pod:=head2 warn_only
void warn_only (parser, onoff) ... SV * onoff; CODE: parser->warn_only = SvTRUE (onoff) ? 1 : 0;