Subject: Re: Controlling the expansion of a macro From: Erik Naggum <firstname.lastname@example.org> Date: 2000/07/08 Newsgroups: comp.lang.lisp Message-ID: <email@example.com> * Pekka P. Pirinen | The definition of MACROLET says "The macro-expansion functions | defined by MACROLET are defined in the lexical environment in which | the MACROLET form appears.", so it definitely does not include the | names defined by the MACROLET form itself. I've been reading this over several times, and I cannot fathom how you conclude what you do. Without the "not", it seems abundantly clear, however. I read it to state that macrolet does not create a _new_ lexical environment, but rather to use the lexical environment the macrolet appears in, which means that all the macros are available simultaneously at _expansion_ time. I'm not sure what the confusion is, but there is clearly a confusion when referring to "recursive" macros. Let me illustrate what I mean: (macrolet ((foo (x) `(progn (bar x) (first ,x))) (bar (x) (ignore-errors (foo x))) (zot (x) `(foo ,x))) (let ((y (list 1 2 3))) (zot y))) A call to bar yields an error, as expected, but a call to zot expands to (progn nil (first y)), also as expected, which means that (1) the call to bar from foo happens at macro-expansion time, when bar is defined, (2) the call to foo from bar refers to a foo outside the lexical scope of the macrolet which doesn't exist, and (3) the call to foo from zot happens at macro-expansion time. I find all of this eminently supported by the standard, so I'm not even sure what Pekka is arguing against, either. #:Erik -- If this is not what you expected, please alter your expectations.