That's because of the order of the definitions of foobar and let. Thus: guik.evil=> (macroexpand '(foobar 10)) (let* [a__44__auto__ 10] (clojure.core/+ a__44__auto__ a__44__auto__))
But defining let before foobar: guik.evil=> (macroexpand-1 '(let)) (guik.evil/let*) guik.evil=> (macroexpand-1 (macroexpand-1 '(let))) 2 guik.evil=> (macroexpand-1 '(foobar 10)) (guik.evil/let [a__17__auto__ 10] (clojure.core/+ a__17__auto__ a__17__auto__)) guik.evil=> (macroexpand-1 (macroexpand-1 '(foobar 10))) java.lang.IllegalArgumentException: Wrong number of args (4) passed to: evil$let (NO_SOURCE_FILE:0) which is fine since let now takes no args. But this will activate the local let*: guik.evil=> (defmacro let [& args] `(guik.evil/let*)) #'guik.evil/let guik.evil=> (foobar 10) 2 On Apr 10, 6:50 pm, George Rogers <atbusb...@gmail.com> wrote: > (ns guik.evil) > ;;1) Special forms cannot be shadowed > (defmacro let* [] > (+ 1 1)) > ;; (let*) ; would yield > ;=> clojure.lang.Compiler$CompilerException: > java.lang.IllegalArgumentException: Bad binding form, expected vector > (evil.clj:6) > ;;2) Shadowing a macro does not change macros that depend on it. > (defmacro foobar [x] > `(let [a# ~x] > (+ a# a#))) > (defmacro let [] > `(guik.evil/let*)) > (foobar 10) ;=> 20 -- 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
