wp-admin/includes/deprecated.php:1249Retrieves the screen icon (no longer used in 3.8+).
stringfunction get_screen_icon() { _deprecated_function( __FUNCTION__, '3.8.0' ); return '<!-- Screen icons are no longer used as of WordPress 3.8. -->';}Introduced in 3.2.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-admin/includes/deprecated.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.