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bug#19734: 25.0.50; nested backquotes: recent changes not backward compa
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From: |
Stefan Monnier |
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Subject: |
bug#19734: 25.0.50; nested backquotes: recent changes not backward compatible |
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Date: |
Fri, 30 Jan 2015 16:01:55 -0500 |
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User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) |
> * lisp/emacs-lisp/backquote.el (backquote-process): Optimize away
> the ,' case.
> were not backwards compatible. If this was intended (?), it should be
> mentioned in the news I think.
As the commit message indicates, this was supposed to be an
optimization, i.e. no change in observable behavior.
> In trunk, the backquote expression evals to something different now, and
> ,,'(my-make-feh-cmd)
> from above must now be
> ,(my-make-feh-cmd)
Yes, your rewrite is correct and desirable, but indeed we had a bug
which I've just fixed in master. Thanks.
Stefan