C: a1 LIST "" ("foo")
  S: * LIST () "/" foo
  S: a1 OK done

  C: a2 LIST (SUBSCRIBED) "" "foo/*"
  S: * LIST (\Subscribed \NonExistent) "/" foo/bar
  S: a2 OK done

  C: a3 LIST (SUBSCRIBED RECURSIVEMATCH) "" foo RETURN (CHILDREN)
  S: * LIST (\HasNoChildren) "/" foo ("CHILDINFO" ("SUBSCRIBED"))
  S: a3 OK done