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Created October 19, 2011 at 10:39 AM
Updated February 24, 2012 at 6:41 PM
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I'm sure 'built in' is probably not the right term here, but I'm not sure what these are called.
I ran into this issue earlier today while fixing a bug in clojail. Built in vars, particularly ones listed here without a source link: http://clojure.github.com/clojure/clojure.core-api.html, do not have :dynamic metadata despite being dynamic. This includes *in*, *out*, and *err* among others. Here are some examples:
user=> (meta #'*err*) {:ns #<Namespace clojure.core>, :name *err*, :added "1.0", :doc "A java.io.Writer object representing standard error for print operations.\n\n Defaults to System/err, wrapped in a PrintWriter"} user=> (meta #'*in*) {:ns #<Namespace clojure.core>, :name *in*, :added "1.0", :doc "A java.io.Reader object representing standard input for read operations.\n\n Defaults to System/in, wrapped in a LineNumberingPushbackReader"} user=> (meta #'*out*) {:ns #<Namespace clojure.core>, :name *out*, :added "1.0", :doc "A java.io.Writer object representing standard output for print operations.\n\n Defaults to System/out, wrapped in an OutputStreamWriter", :tag java.io.Writer} user=> (meta #'*ns*) {:ns #<Namespace clojure.core>, :name *ns*, :added "1.0", :doc "A clojure.lang.Namespace object representing the current namespace.", :tag clojure.lang.Namespace}