> If so, it's only the subforms not in operator position that get > macroexpanded first. Otherwise > > user=> (defmacro qqq [] 'if) > #'user/qqq > user=> ((qqq) (even? 42) "boo!") > #<CompilerException java.lang.Exception: Unable to resolve symbol: if > in this context (NO_SOURCE_FILE:607)> > > would instead produce "boo!", as (qqq) would be expanded to if and > then (if (even? 42) "boo!") would be parsed and discovered to be an if > special form.
I think your macro (qqq) is being expanded to if: it's right there in the error message. The parsing of (if (even? 42) "boo!" as a special form cannot occur because the processing is past the opening paren; macroexpanding the first element won't produce the re-evaluation of the form as a whole, which is the only case where the 'if' is recognized as the start of a special form. I find it easier to think of special forms and not special symbols. > > On the other hand, > > user=> (quote (qqq)) > (qqq) > > seems to indicate that nothing is macroexpanded before special form > parsing occurs, or it would have output if instead of (qqq), unless > quote it another special case. Well, quote is a special form, of course. I'd think that special forms can happen after macroexpansion, as is the case when a macro produces a conditional. -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
