bug#12942: trunk does not bootstrap: Symbol's function definition is void: \,

bug#12942: trunk does not bootstrap: Symbol's function definition is void: \,

[Paul Eggert]

Starting with trunk rev 110952:

	revno: 110952
	committer: Stefan Monnier <monnier@iro.umontreal.ca>
	timestamp: Mon 2012-11-19 16:30:55 -0500
	message:
	  * lisp/emacs-lisp/byte-run.el (defun-declarations-alist):
	  Allow compiler-macros to be lambda expressions.
	  * lisp/progmodes/python.el: Use cl-lib.  Move var declarations outside of
	  eval-when-compile.
	  (python-syntax-context): Add compiler-macro.
	  (python-font-lock-keywords): Simplify with De Morgan.

"make bootstrap" fails for me (Fedora 17, x86-64, GCC 4.7.2) with
the following "make" output.  The failure is still there in trunk
rev 110959, the current rev as of this writing.

...
if test "no" = "yes"; then \
  rm -f bootstrap-emacs; \
  ln temacs bootstrap-emacs; \
else \
  `/bin/pwd`/temacs --batch --load loadup bootstrap || exit 1; \
  test "X" = X ||  -zex emacs; \
  mv -f emacs bootstrap-emacs; \
fi
Loading loadup.el (source)...
Using load-path (/home/eggert/src/gnu/emacs/trunk-110952/lisp /home/eggert/src/\
gnu/emacs/trunk-110952/lisp/emacs-lisp /home/eggert/src/gnu/emacs/trunk-110952/\
lisp/language /home/eggert/src/gnu/emacs/trunk-110952/lisp/international /home/\
eggert/src/gnu/emacs/trunk-110952/lisp/textmodes)
Loading emacs-lisp/byte-run (source)...
Loading emacs-lisp/backquote (source)...
Loading subr (source)...
Loading version (source)...
Loading widget (source)...
Loading custom (source)...
Loading emacs-lisp/map-ynp (source)...
Loading international/mule (source)...
Loading international/mule-conf (source)...
Loading env (source)...
Loading format (source)...
Loading bindings (source)...
Loading cus-start (source)...
Loading window (source)...
Loading /home/eggert/src/gnu/emacs/trunk-110952/lisp/files.el (source)...
Loading /home/eggert/src/gnu/emacs/trunk-110952/lisp/emacs-lisp/macroexp.el (so\
urce)...
Loading /home/eggert/src/gnu/emacs/trunk-110952/lisp/emacs-lisp/pcase.el (sourc\
e)...
Loading /home/eggert/src/gnu/emacs/trunk-110952/lisp/emacs-lisp/macroexp.el (so\
urce)...
Loading /home/eggert/src/gnu/emacs/trunk-110952/lisp/cus-face.el (source)...
Loading /home/eggert/src/gnu/emacs/trunk-110952/lisp/faces.el (source)...
Loading /home/eggert/src/gnu/emacs/trunk-110952/lisp/button.el (source)...
Loading /home/eggert/src/gnu/emacs/trunk-110952/lisp/startup.el (source)...
Loading /home/eggert/src/gnu/emacs/trunk-110952/lisp/ldefs-boot.el (source)...
Loading /home/eggert/src/gnu/emacs/trunk-110952/lisp/minibuffer.el (source)...
Symbol's function definition is void: \,
make[2]: *** [bootstrap-emacs] Error 1
make[2]: Leaving directory `/home/eggert/src/gnu/emacs/trunk-110952/src'
make[1]: *** [src] Error 2
make[1]: Leaving directory `/home/eggert/src/gnu/emacs/trunk-110952'
make: *** [bootstrap] Error 2