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Home/ Questions/Q 6165297
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Editorial Team
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Editorial Team
Asked: May 23, 20262026-05-23T22:08:25+00:00 2026-05-23T22:08:25+00:00

(let ((a 1) (b (+ a 1))) (message a)) This throws the error Debugger

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(let ((a 1) (b (+ a 1)))
  (message a))

This throws the error

Debugger entered--Lisp error: (void-variable a)

What’s the canonical way to do this?

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  1. Editorial Team
    Editorial Team
    2026-05-23T22:08:26+00:00Added an answer on May 23, 2026 at 10:08 pm

    The canonical way is to use let* (also note that I added a %s format string to your message form):

    (let* ((a 1) (b (+ a 1)))
      (message "%s" a))
    

    The let* function allows you to reference other variables that have previously been defined.

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