+acl: ${acl
+acl: ${acl}
+acl: ${acl {a_bad}}
+acl: ${acl {a_ret}}
+acl: ${acl {a_ret}{person@dom.ain}}
+acl: ${acl {a_ret}{firstarg}{secondarg}}
+acl: ${acl {a_ret}{arg with spaces}}
+acl: ${acl {a_none}}
+acl: ${acl {a_none}{person@dom.ain}}
+acl: ${acl {a_deny}}
+acl: ${acl {a_deny}{person@dom.ain}}
+acl: ${reduce {1:2:3:4} {} {$value ${acl {a_ret}{$item}}}}
+