wp-includes/link-template.php:3244Displays the link to the previous comments page.
$labelstringoptional''function previous_comments_link( $label = '' ) { echo get_previous_comments_link( $label );}Introduced in 2.7.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/link-template.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.