format_it != formats.end() && filename_it != filenames.end();
++format_it, ++filename_it) {
check_config (warnings, timespan_state, channel_config_state, *format_it, *filename_it);
format_it != formats.end() && filename_it != filenames.end();
++format_it, ++filename_it) {
check_config (warnings, timespan_state, channel_config_state, *format_it, *filename_it);