there are a number of vars that are bound in clojure.main's repl,
*assert* is one of them. So in the repl you can use set!.

On Thu, Mar 11, 2010 at 3:25 PM, Benjamin Teuber
<bsteu...@googlemail.com> wrote:
>> > (def *assert* false)
>>
>> You cannot use def to change the value of a var in another namespace.
>> This is nothing specific to *assert* or to clojure.core.
>
>> Here is what you can do instead:
>>
>>         (alter-var-root (var *assert*) (fn [_] false))
>
> I actually tried from inside clojure.core, and actually alter-var-root
> doesn't do the job either - maybe because there's already a thread-
> local binding there which shadows the root?
>
>> However, what you probably want is
>>
>>         (set! *assert* false)
>
> Great, indeed :)
>
> And thanks for your warning about macroexpand-all.
>
> Benjamin
>
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