Crash on visiting C files

[Chong Yidong]

The following recent checkin to the branch causes Emacs to crash on
visiting any C file:

2007-08-22  Stefan Monnier  <address@hidden>

* lread.c: (Qold_style_backquotes): New var.
(syms_of_lread): Init and staticpro it.
(load_warn_old_style_backquotes): New fun.
(Fload): Use them to warn about old style backquotes.
(end_of_file_error, Fload): Remove unused vars.


Program received signal SIGSEGV, Segmentation fault.
0x00000004 in ?? ()
(gdb) bt
#0  0x00000004 in ?? ()
#1  0x081b7e2c in unbind_to (count=-2071009280, value=2312) at eval.c:3353
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

Lisp Backtrace:
"require" (0x86803d1)
"byte-code" (0x882e913)
"c-mode" (0x8441dd5)
"set-auto-mode-0" (0x83eecc1)
"set-auto-mode" (0x0)
"normal-mode" (0x838f8f9)
"after-find-file" (0x838f8c9)
"find-file-noselect-1" (0x85ca604)
"find-file-noselect" (0x867948b)
"find-file" (0x867948b)
"call-interactively" (0x83e0a01)