```
3643 '_compile_all' => <<'END_OF_FUNC',
3644 sub _compile_all {
3645     foreach (@_) {
3646         next if defined(&$_);
3647         $AUTOLOAD = "CGI::$_";
3648         _compile();
3649     }
3650 }
3651 END_OF_FUNC
3652
3653 );
3654 END_OF_AUTOLOAD
3655 ;

```

How does `END_OF_FUNC` and `END_OF_AUTOLOAD` work here?