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Bug with lexical-binding and package-install?

From: Magnar Sveen
Subject: Bug with lexical-binding and package-install?
Date: Mon, 19 Nov 2012 07:50:10 +0100

I got a bug report yesterday in which my package was broken because lexical scoping was suddenly in effect.

After some init-file-bisecting, this is the conclusion:

> It appears as though your first instinct about lexical-binding is correct. I had a ;;; -*- lexical-binding: t -*- directive in my init-packages.el file, which is responsible for downloading the installing missing packages (of which multiple-cursors.el is one).
> It seems that if the file which calls package-install has that flag turned on, it applies the lexical binding to the compiler, which results in the following compiler warning:
> In mc/region-strings:
> mc-mark-more.el:78:20:Warning: assignment to free variable `strings'
> This warning doesn't appear in the compiler messages if lexical-binding is nil.

This is on Emacs 24.2.1 on OS X. Full compiler warnings and code excerpts can be found here:


- Magnar Sveen

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