Currently, linting `src/future/http/HTTPSFuture.php` from rPHU will raise the following error:
```
Error (XHP31) Use Of PHP 5.3 Features
This codebase targets PHP 5.2.3, but `curlfile` was not introduced until
PHP 5.5.0.
532 // use this "@" stuff.
533
534 if (class_exists('CURLFile')) {
>>> 535 $file_value = new CURLFile((string)$tmp, $info['mime'], $info['name']);
536 } else {
537 $file_value = '@'.(string)$tmp;
538 }
```
However, since this class is being used conditionally, it //should// be fine and no linter errors should be being raised.