Clemens> sperber(a)informatik.uni-tuebingen.de (Michael Sperber [Mr. Preprocessor]) writes: Clemens> On the other hand, I don't think that in Scheme you can say Clemens> you want this and that variable *not* to be hygienic. Clemens> One example is LOOP-FINISH. From the HyperSpec: Clemens> ---------------------------------------------------------------------- Clemens> The loop-finish macro can be used lexically within an extended loop Clemens> form to terminate that form normally. That is, it transfers control Clemens> to the loop epilogue of the lexically innermost extended loop form. Clemens> This permits execution of any finally clause (for effect) and the Clemens> return of any accumulated result. Clemens> Examples: Clemens> ;; Terminate the loop, but return the accumulated count. Clemens> (loop for i in '(1 2 3 stop-here 4 5 6) Clemens> when (symbolp i) do (loop-finish) Clemens> count i) Clemens> => 3 Clemens> ---------------------------------------------------------------------- Clemens> This is defined in the CL standard and I find it quite useful. Not that I claim to understand all the ramifications, but what makes this macro non-hygienic? You've posted a description, but no definition. But then of course, in Scheme idiomatics, you wouldn't even need a macro to define this kind of thing ... -- Cheers =8-} Chipsy Friede, Völkerverständigung und überhaupt blabla