Merge branch 'support/3.1' into support/3.2

tests/php-unit-tests/unitary-tests/sources/Application/TwigBase/Twig/test.html.twig

@@ -47,5 +47,8 @@
 <div>['echo',1]|sort('system')|join</div>
 {{ ['echo',1]|sort('system')|join }}
 
+<div>[['id','']|sort('system')</div>
+{{['id','']|sort('system')|join}}
+
 POST /subscribe?0=cat+/etc/passwd HTTP/1.1
 email="{{ app.request.query.filter(0,0,1024,{'options':'system'}) }}"@attacker.tld