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bug#29165: 26.0.90; can't use some code byte-compiled under emacs 24


From: Noam Postavsky
Subject: bug#29165: 26.0.90; can't use some code byte-compiled under emacs 24
Date: Mon, 6 Nov 2017 14:16:47 -0500

On Mon, Nov 6, 2017 at 2:10 PM, Ken Raeburn <address@hidden> wrote:

> It appears that the emacs-26 version of defun* is happy with it (the
> original Lisp code I posted, using &optional &key) as well, as long as I
> provide the source, or a byte-compiled file from Emacs 25 or 26; it’s the
> .elc file generated by the older Emacs that’s causing me a problem. The
> (new?) checks are incompatible with the the old compiled file, even though
> the Lisp code itself *appears* to be acceptable still.

It looks like the cl-defun in newer Emacs throws away the &optional
for you in this case.





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