Your particular example is equivalent to #?(:clj) which is illegal, for the reason given in the error message you saw.
Normal Clojure comments are far less surprising in their behavior than #_ is I understand there can be convenience in using #_ when it works. Andy Sent from my iPhone > On Apr 13, 2015, at 12:38 PM, whodidthis <ton...@gmail.com> wrote: > > > >> On Monday, April 13, 2015 at 4:48:28 PM UTC+3, Alex Miller wrote: >> I think what you're seeing here makes sense. >> >>> On Sunday, April 12, 2015 at 3:39:15 PM UTC-5, whodidthis wrote: >>> Are there any thoughts on code like this: >>> >>> #_ >> >> This says to ignore the next read form.... >> >>> #?(:cljs (def unrelated-1 nil)) >> >> This evaluates to *nothing*, ie nothing is read, so it is not ignored by the >> #_. >> >>> #?(:cljs (def unrelated-2 nil)) >>> #?(:cljs (def unrelated-3 nil)) >> >> These also read as *nothing*. >> >>> #?(:clj (def n 10)) >> >> This *is* read, but ignored per the prior #_ >> >>> #?(:clj (defn num [] n)) >>> ; compile on clj =>RuntimeException: Unable to resolve symbol: n >> >> And then this makes sense. >> >>> >>> I guess it's fine if it continues to work that way but I can imagine it >>> being a little surprising from time to time heh >> >> Conditional reading is definitely something to be careful about - I think in >> this case you are combining two types of conditional reading so be doubly >> careful. :) >> >> To get the effect you want in this, using #_ *inside* the reader conditional >> would work: >> >> #?(:cljs #_(def unrelated-1 nil)) > > Sorry, back to this stuff again. I tried using discard inside but > > #?(:clj #_'whatever) > > just throws > > CompilerException java.lang.RuntimeException: read-cond starting on line 32 > requires an even number of forms" > > when compiling on clojure. > > Would be nice to have a way to ignore reader conditional forms or the thingie > things inside but there does not seem to be an easy way. > -- > Note that posts from new members are moderated - please be patient with your > first post. > --- > You received this message because you are subscribed to the Google Groups > "ClojureScript" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to clojurescript+unsubscr...@googlegroups.com. > To post to this group, send email to clojurescript@googlegroups.com. > Visit this group at http://groups.google.com/group/clojurescript. -- Note that posts from new members are moderated - please be patient with your first post. --- You received this message because you are subscribed to the Google Groups "ClojureScript" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojurescript+unsubscr...@googlegroups.com. To post to this group, send email to clojurescript@googlegroups.com. Visit this group at http://groups.google.com/group/clojurescript.
