Ah yes, I see that
here:
https://github.com/clojure/clojure/blob/clojure-1.6.0/src/clj/clojure/main.clj#L64-L86
Thanks for the quick response!
On Saturday, August 16, 2014 1:36:11 PM UTC+1, Nicola Mometto wrote:
>
>
> Because in the repl you're using a thread-local value of *data-readers*,
> not the var root, this is because the repl is executed under (binding
> [*data-readers ..] ..)
>
> If you try to set! *data-readers* instead, you'll see what you expect.
>
> Consider:
> user=> (def ^:dynamic x nil)
> #'user/x
> user=> x
> nil
> user=> (binding [x 2] (alter-var-root #'x (constantly 1)) x)
> 2
> user=> x
> 1
> user=> (binding [x 2] (set! x 3) x)
> 3
> user=> x
> 1
>
> Nicola
>
> Kevin webster writes:
>
> > Can someone explain why this is not altering the *data-readers* dynamic
> > var? Does this work for anyone else? Using 1.6.0
> >
> > (assert (= {} *data-readers*))
> > ;; nil
> >
> > (alter-var-root (var *data-readers*) (fn [_] {:test 2}))
> > ;; {:test 2}
> >
> > (assert (= {:test 2} *data-readers*))
> > ;; AssertionError
> >
> > (assert (= {:test 2} (alter-var-root (var *data-readers*) identity)))
> > ;; nil
> >
> > Thanks!
>
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