This is a bad idea, but you can extend IOFactory to nil within your own
programs:
https://github.com/clojure/clojure/blob/master/src/clj/clojure/java/io.clj#L182
to return your nullreader.

On Wed, Jun 3, 2015 at 3:28 PM Elric Erkose <[email protected]> wrote:

> @tassilo Your concern could be addressed with a NullReader
>
> user=> (defn NullReader []
>          (proxy [java.io.Reader] []
>            (close [] nil)
>            (read [a b c] -1)))
> #'user/NullReader
>
> user=> (slurp (NullReader))
> ""
>
> However, this does not resolve my question because "" is not nil. Even
> with a NullReader, one would have to "explicitly check for [before] hand or
> handle via try/catch after the fact", like @sean said, to distinguish a
> valid NullReader intent from an errant parameter.
>
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