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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: missing lexical-binding cookie warning when loading .el files
Date: Fri, 03 May 2024 20:59:58 +0300
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To: Mattias =?utf-8?Q?Engdeg=C3=A5rd?= <mattias.engdegard@gmail.com>
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 Mattias =?utf-8?Q?Engdeg=C3=A5rd?= on Fri, 3 May 2024 19:28:02 +0200)
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> From: Mattias Engdegård <mattias.engdegard@gmail.com>
> Date: Fri, 3 May 2024 19:28:02 +0200
> 
> There is now a warning about missing -*-lexical-binding:...-*- cookie in .el files being loaded, since not all Lisp code is compiled. The idea is that dealing with the odd warnings now is better than being surprised by sudden change of behaviour in Emacs 31, when lexical-binding will be enabled by default.

Please announce this in NEWS, if you didn't already.