Jacek Generowicz <jacek.generow...@googlemail.com> writes: > (def ++ +) > (defn foo-core [a b] (+ a b)) > (defn foo-user [a b] (++ a b)) > (binding [+ - > ++ -] > [(foo-core 1 1) (foo-user 1 1)]) > > Gives the result: > > [2 0] > > which suggests that some vars are immune to binding. > > Could someone please point me to the chapter and verse describing this?
This is also affected by direct binding. It's not documented anywhere outside the IRC logs to my knowledge, but if you look at line 2818 of Compiler.java you can see the criteria whereby certain vars are made "direct", improving the call-time performance, but making it impossible to rebind them. Currently all vars inside a namespace that begins with clojure with root bindings that are functions are subject to this feature, though this criteria will hopefully change in the future. -Phil
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