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reference variable before definition

From: Eric Abrahamsen
Subject: reference variable before definition
Date: Sat, 11 Mar 2017 18:03:05 -0800
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (gnu/linux)

I can't tell if it's always been this way: I'm getting compiler warnings
about "reference to free variable" if the variable appears in a function
definition before it's defined in the file. So compiling this produces

(defun make-my-day ()
  (message "It's: %s" my-day))

(defvar my-day "Monday")

Has it always been this way, and it only just got through to me? I
didn't think it was necessary to define everything before use in a

Hoping I'm just hallucinating something,

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