Haanga_Compiler_Exception if forloop.last is used in an array returned by an object method

[josepanguera]

With this object:

class Obj {
    public function method(){
        return array('a', 'b');
    }
}

and this template:

{% for a in obj.method %}
  {{ a }}

  {% if forloop.last %}
    test
  {% endif %}
{% endfor %}

an exception is thrown:

exception 'ErrorException' with message
'call_user_func_array() expects parameter 2 to be array, object given' in /.../vendor/crodas/haanga/lib/Haanga/AST.php:534

Stack trace:
#0 [internal function]: Slim\Slim::handleErrors(2, 'call_user_func_...', '/home/z/project...', 534, Array)
#1 /.../vendor/crodas/haanga/lib/Haanga/AST.php(534): call_user_func_array(Array, Object(Haanga_AST))
#2 /.../vendor/crodas/haanga/lib/Haanga/Compiler.php(1150): hvar_ex(Object(Haanga_AST))
#3 /.../vendor/crodas/haanga/lib/Haanga/Compiler.php(483): Haanga_Compiler->generate_op_loop(Array, Object(Haanga_AST))
#4 /.../vendor/crodas/haanga/lib/Haanga/Compiler.php(296): Haanga_Compiler->generate_op_code(Array, Object(Haanga_AST))
[...]

It does not happen with forloop.first.