Installing emacs-snapshot results in error messages `Eager macro-expansion failure: (wrong-type-argument sequencep 769)' while pre-compiling debian add-on packages like `apel' (see attachment). Since the errors occour with several packages I assume a bug in emacs. The problematic invocation is emacs -q -no-site-file -batch -l __myinit.el -f batch-byte-compile alist.el apel-ver.el atype.el broken.el calist.el emu.el file-detect.el filename.el install.el inv-19.el inv-23.el invisible.el mcharset.el mcs-20.el mcs-e20.el mule-caesar.el path-util.el pccl-20.el pccl.el pces-20.el pces-e20.el pces.el pcustom.el poe.el poem-e20_3.el poem-e20.el poem.el product.el pym.el richtext.el static.el tinycustom.el with __myinit.el being: #+BEGIN_SRC emacs-lisp (setq load-path (cons "." load-path)) (setq byte-compile-warnings nil) #+END_SRC It is possible to install emacs-snapshot as of 2013-07-24 but not as of 2013-08-04 or as of 2013-08-10. Therefore I bisected the recent commit history. First "bad" commit is: commit 65ca9602f8bb761180ef8589db6bfce6f55251f7 Refs: HEAD, refs/bisect/bad Author: Stefan Monnier AuthorDate: Thu Aug 1 19:18:37 2013 -0400 Commit: Stefan Monnier CommitDate: Thu Aug 1 19:18:37 2013 -0400 * lisp/files.el: Use lexical-binding. (dir-locals-read-from-file): Remove unused `err' variable. (hack-dir-local-variables--warned-coding): New var. (hack-dir-local-variables): Use it to avoid repeated warnings. (make-backup-file-name--default-function): New function. (make-backup-file-name-function): Use it as default. (buffer-stale--default-function): New function. (buffer-stale-function): Use it as default. (revert-buffer-insert-file-contents--default-function): New function. (revert-buffer-insert-file-contents-function): Use it as default. (insert-directory): Avoid add-to-list. * lisp/autorevert.el (auto-revert-handler): Simplify. Use buffer-stale--default-function. --- lisp/ChangeLog | 17 +++++ lisp/autorevert.el | 12 ++-- lisp/files.el | 204 +++++++++++++++++++++++++++------------------------- 3 files changed, 130 insertions(+), 103 deletions(-) Since I don't understand elisp I'm lost here. Thanks for your attention, Gregor