Use macroexpand-1 to expand a call to this macro, and it should be clear what is going on. The expanded code tries to call 5 as a function. What you are probably trying to do here is make (5 + 2) a list, not a function call.
;; (note the unquote splicing of e) (defmacro infix [e] `(let [[x# f# y#] (list ~@e)] (f# x# y#))) 2011/9/26 Aaron Cohen <aa...@assonance.org>: > > > 2011/9/26 ru <soro...@oogis.ru> >> >> That's exactly means evaluation of argument that's contradict to >> mentioned above documentation! >> >> On 26 сен, 18:18, Tassilo Horn <tass...@member.fsf.org> wrote: >> > > Ok, this is working! But, what's the difference? >> > >> > Your code: >> > >> > user=> (defmacro infix [e] `(let [[x# f# y#] ~e] (f# x# y#))) >> > >> > The ~e evaluates the given form, which looks like a function but is not. >> > >> > In other words, your version of infix expands to approximately: (let [x_1 > f_2 y_3] (5 + 4)] (f_2 x_1 y_3)) and the destructuring in "let" is what > causes the problem at runtime. > > -- > 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 -- 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
