I restarted the Emacs CIDER REPL, and now it seems to work fine. Maybe I
just don't understand how to use this CIDER REPL properly.

On 05/26/2017 07:58 AM, Gary Trakhman wrote:
> There shouldn't be a difference, I would suspect a typo in your file.
> 
> The error 'ClassCastException java.awt.image.BufferedImage cannot be cast to
> clojure.lang.IFn  tutorial.core/-main (core.clj:11)' would lead me to
> look for things like '(img)' where the object ends up in call position
> of the s-expression.
> 
> On Fri, May 26, 2017 at 11:54 AM Christopher Howard
> <christopher.how...@qlfiles.net <mailto:christopher.how...@qlfiles.net>>
> wrote:
> 
>     When I run
> 
>     tutorial.core> (let [img (new-image 32 32)] (set-pixel img 10 10 cyan)
>     (show img))
> 
>     from the REPL, this returns a javax.swing.JFrame object, and displays
>     the frame and image as expected. However, if put the same in
> 
>     (defn -main
>       "Generates image."
>       [& args]
>       (let [img (new-image 32 32)]
>         (set-pixel img 10 10 cyan)
>         (show img)))
> 
>     in more core.clj, and run (-main) from the REPL, I get error
> 
>     ClassCastException java.awt.image.BufferedImage cannot be cast to
>     clojure.lang.IFn  tutorial.core/-main (core.clj:11)
> 
>     Why the difference?
> 
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