$ ./vendor/bin/phpstan analyse src/Carbon/Carbon.php
 ------ -------------------------------------------------------------------------
  Line   Carbon.php
 ------ -------------------------------------------------------------------------
         Internal error: Argument 1 passed to
         PHPStan\Analyser\Scope::assignVariable() must be of the type string,
         object given, called in
         Carbon\vendor\phpstan\phpstan\src\Analyser\NodeScopeResolver.php on line
         701
 ------ -------------------------------------------------------------------------


 [ERROR] Found 1 error

```

phpstan version : master (commit 319baa6)