wp-admin/includes/deprecated.php:201Determines the language to use for CodePress syntax highlighting.
$filenamestringfunction codepress_get_lang( $filename ) { _deprecated_function( __FUNCTION__, '3.0.0' );}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-admin/includes/deprecated.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.