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The issue has come up in the discussion, but hasn't really been in the focus yet: I'd like to suggest that compound expressions be represented by an opaque type rather than by pairs. This would ensure a modicum of abstraction, and would *really* make comprehensive the ability of all syntax objects to carry location information. I've come to appreciate this added layer of abstraction in PLT Scheme. -- Cheers =8-} Mike Friede, Völkerverständigung und überhaupt blabla