[racket] how to use 'lazy' from racket/promise

From: Danny Yoo (dyoo at hashcollision.org)
Date: Tue Apr 9 19:50:02 EDT 2013

Are you sure you're not looking for the racket/stream library instead?
 For example:

    #lang racket
    (require racket/stream)
    (define ones (stream-cons 1 ones))

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