wp-includes/widgets/class-wp-widget-recent-comments.php:210Flushes the Recent Comments widget cache.
public function flush_widget_cache() { _deprecated_function( __METHOD__, '4.4.0' ); }Introduced in 2.8.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/widgets/class-wp-widget-recent-comments.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.