For debuging I like

  (define (show x)
    (display x)
    x)

  (define (noshow x)
    x)

For example in

  (define (average x)
    (/ (+ (car x) (show (cdr x))) 2))

noshow is useful to turn on/off them fast.

But this is different from the convension of << in the streams of C, that
return the stream instead of the value, something like

  (<< (<< cout "Hello ") "Word!")

Gustavo

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