[Cocci] How to concatenate identifier with text?

[Timur Tabi]

@@
identifier func;
@@
func(...) {
<+...
     .... stuff
+   goto func_exit;
+}
...+>
}

So if I have this code:

void myfunc(int x)
{
}

I want it to look like this:

void myfunc(int x)
{
    goto myfunc_exit;
}

My problem is that cocci takes "func_exit" literally.  I tried
func##_exit, but that didn't work.  How do I make this work?
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