Typecache does not contain include tags created at expansion

Hello,

I was trying to properly support PHP "use" statement in CEDET and I got 
some difficulties that looks like a bug in semanticdb caching.

Just to recall, PHP use statement is something like a name aliasing. 
When you write, for example

    use MyNamespace\MyClass as TheClass;


Then you can refer to "MyNamespace\MyClass" by the name "TheClass".

However, in PHP, types are loaded automatically when they are used, you 
do not need to use some "include" or "require" statement.

To include "MyNamespace\MyClass" in the buffer, I though I could create 
an include tag when expanding the aliases created by the use statement 
(I need to expand them anyway), so I did it.

So now, when I am working in this PHP file :

    <?php
    namespace AnotherNs;

    use NewNs\SuperGreeter as Greeter;

    class SuperGreeterCaller
    {
         public function callSuperGreeter(Greeter $greeter)
         {
             $greeter->
         }
    }


I get the following structure (result simplified from bovinate) :

    (("AnotherNs" type
       (:members
        (("SuperGreeterCaller" type
          (:members
           ( ... )
           :type "class"))

         ("/<project dir>/src/NewNs/SuperGreeter.php" include nil)

         ("Greeter" type
          (:superclasses "\\NewNs\\SuperGreeter" :type "use")))

        :type "namespace")))

So the include tag has succesfully been integrated into the tag table.

However, when I run "M-x semanticdb-typecache-dump" in a recently 
started emacs, I get :

    ]#<semanticdb-typecache /<project
    dit>/src/AnotherNs/SuperGreeterCaller.php>
        ] Name: "/<project dir>/src/AnotherNs/SuperGreeterCaller.php"
        ] Class: #'semanticdb-typecache
        ] filestream #<TAG LIST: 1 entries>
        ] includestream : nil
        ] stream : nil
        ] dependants #<list o' stuff: 1 entries>

There is nothing in includestream. When I run emacs for a while, it 
happens includestream contains the expected included tags !

Am I doing something wrong, or could it be an unwanted behaviour ?

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