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Re: reference variable before definition

From: Stefan Monnier
Subject: Re: reference variable before definition
Date: Sat, 11 Mar 2017 22:18:48 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux)

> 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
> function...

I think it's been that way for a while, yes.  It used not to be terribly
important, indeed, but since Emacs-24 it became a lot more important,
because the byte-compiler compiles variables differently if they've been
declared via `defvar`.  And it doesn't first scan the buffer for
defvars, so by the time it sees the defvar it has already (mis)compiled
the earlier uses of that variable.


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