wp-includes/deprecated.php:3743Retrieve path of comment popup template in current or parent template.
stringfunction get_comments_popup_template() { _deprecated_function( __FUNCTION__, '4.5.0' ); return '';}Introduced in 1.5.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/deprecated.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.