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Per Bothner wrote: > Am I correct in understanding that any quoted S-expressions, in either a > macro "parameter" or in a template, is copied? You are. > I don't know if this is a big deal, but it breaks pair identity in cases > where it is preserved in existing implementations. This seems to make > SRFI-72 essentially incompatible with SRFI-38, in the sense that you > can't use of SRFI-38 shared structure in programs (though it is still > available for external data). And of course cycles are prohibited. Good point. I assume you mean expressions like (define ones (quote #0=(1 . #0#))) The procedures that would have to be changed to support this are the current implementations of datum->syntax and syntax->datum, essentially lifting the algorithm of SRFI-38 in the way you suggest. Regards Andre