Well, when used as the first element of a list. (And I certainly wouldn't use them as local names, since that would be extremely confusing; I was trying to verify the correctness of some code I'm working on.)
But I called these "extra-special" because, in my understanding of the term, "special form" generically just refers to something with non-normal evaluation order (or special evaluation semantics generally). "when", in this definition, is a special form, as are "fn" and "let" (both of which are listed as special forms on http://clojure.org/special_forms). But neither "fn" nor "let" is special the way "let*", "fn*", "do", or the other *extra*-special forms are: user> (let [fn (fn [x] x)] (fn 4)) 4 user> (let [let (fn [x] x)] (let 4)) 4 Thinking about it more, I suppose you're thinking of what's returned by clojure.lang.Compiler/specials, except several of them can be used just fine in this pattern: user> (let [& (fn [x] x)] (& 1)) 1 The above also works for finally and catch. Anyway, I'm surprised one can establish local bindings for these guys at all. On Sun, Jun 23, 2013 at 2:46 PM, Ambrose Bonnaire-Sergeant < abonnaireserge...@gmail.com> wrote: > Special forms are special when used in a list. IMO it's a bad idea to use > special forms > as local names, a caveat which is surprisingly under-documented. > > Thanks, > Ambrose > > > On Mon, Jun 24, 2013 at 5:38 AM, Ben Wolfson <wolf...@gmail.com> wrote: > >> This strikes me as pretty odd: >> >> user> (let [z 1 >> try 2 >> fn* 3] >> (try (let [x (fn* ([a b c] [a b c]))] >> (x z try fn*)) >> (catch Exception e e))) >> [1 2 3] >> >> >> -- >> Ben Wolfson >> "Human kind has used its intelligence to vary the flavour of drinks, >> which may be sweet, aromatic, fermented or spirit-based. ... Family and >> social life also offer numerous other occasions to consume drinks for >> pleasure." [Larousse, "Drink" entry] >> >> -- >> -- >> 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 unsubscribe from this group and stop receiving emails from it, send an >> email to clojure+unsubscr...@googlegroups.com. >> For more options, visit https://groups.google.com/groups/opt_out. >> >> >> > > -- > -- > 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 unsubscribe from this group and stop receiving emails from it, send an > email to clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- Ben Wolfson "Human kind has used its intelligence to vary the flavour of drinks, which may be sweet, aromatic, fermented or spirit-based. ... Family and social life also offer numerous other occasions to consume drinks for pleasure." [Larousse, "Drink" entry] -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
