Getting Clojure to run (lein repl)

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I'm just trying to get Clojure set up. Here is some code that I am trying to run in lein repl:

(def numbers (into [] (range 0 100)))
(sum numbers)

But I get this error:

CompilerException java.lang.RuntimeException: Unable to resolve symbol: sum in this context, compiling:(NO_SOURCE_PATH:1:1)

I don't know what this means. Is my installation wrong?

asked 26 secs ago

usr55410

1,677

Getting Clojure to run (lein repl)