[quickbook] Why doesn't this work?

I'm rather confused.. I keep trying to use templates to reduce some of 
the repetition in doing the tree TR proposal. And I ran into a strange 
error. I've reduced my problem down to this code:

   [template tr_ref[id] [link [id] tr]]
   [tr_ref hierarchy.req]

It produces this error:

   x.qbk:2: error: Mismatched code bracket

The error happens on the use of the template. If the template isn't used 
it's fine. And if the template is changed to this:

   [template tr_ref[id] [link id tr.[id]]]
   [tr_ref hierarchy.req]

No error happens. Any idea what's going on?

Rene.

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