_complete_debug causes core dump.

[Tanaka Akira <akr@xxxxxxxx>]

_complete_debug causes core dump as follows.

Z(4):akr@serein% Src/zsh -f  
serein% bindkey -e; fpath=($PWD/Completion/*(/)); autoload -U compinit; compinit -D; compdef _tst tst
serein% _tst () {}
serein% tst <C-x>?
zsh: segmentation fault (core dumped)  Src/zsh -f
Z(4):akr@serein% gdb Src/zsh core
GNU gdb 19991004
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There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i586-redhat-linux"...
Core was generated by `Src/zsh -f'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /lib/libdl.so.2...done.
Reading symbols from /lib/libnsl.so.1...done.
Reading symbols from /lib/libtermcap.so.2...done.
Reading symbols from /lib/libm.so.6...done.
Reading symbols from /lib/libc.so.6...done.
Reading symbols from /lib/ld-linux.so.2...done.
Reading symbols from /lib/libnss_files.so.2...done.
Reading symbols from /home/akr/zsh/lib/zsh/3.1.7-pre-3/zsh/zle.so...done.
Reading symbols from /home/akr/zsh/lib/zsh/3.1.7-pre-3/zsh/complete.so...done.
Reading symbols from /home/akr/zsh/lib/zsh/3.1.7-pre-3/zsh/compctl.so...done.
Reading symbols from /home/akr/zsh/lib/zsh/3.1.7-pre-3/zsh/parameter.so...done.
Reading symbols from /home/akr/zsh/lib/zsh/3.1.7-pre-3/zsh/zutil.so...done.
Reading symbols from /home/akr/zsh/lib/zsh/3.1.7-pre-3/zsh/computil.so...done.
#0  0x401f1893 in do_completion (dummy=0x401e2b48, dat=0xbffff3c0) at compcore.c:407
407                 while (!m->mcount)
(gdb) where
#0  0x401f1893 in do_completion (dummy=0x401e2b48, dat=0xbffff3c0) at compcore.c:407
#1  0x80886a9 in runhookdef (h=0x401e2b48, d=0xbffff3c0) at module.c:1615
#2  0x401d4f9b in docompletion (s=0x8101450 "", lst=0, incmd=0) at zle_tricky.c:1703
#3  0x401d20f0 in docomplete (lst=0) at zle_tricky.c:763
#4  0x401d097f in completeword (args=0x401e2ac4) at zle_tricky.c:203
#5  0x401d0857 in completecall (args=0x401e2ac4) at zle_tricky.c:180
#6  0x401c5d01 in execzlefunc (func=0x80f99e8, args=0x401e2ac4) at zle_main.c:645
#7  0x401c591c in zleread (lp=0x80e0a90 "%m%# ", rp=0x0, flags=3) at zle_main.c:564
#8  0x80762b5 in inputline () at input.c:265
#9  0x80761a6 in ingetc () at input.c:210
#10 0x806f088 in ihgetc () at hist.c:242
#11 0x807b4e8 in gettok () at lex.c:621
#12 0x807acd5 in yylex () at lex.c:337
#13 0x8090ee3 in parse_event () at parse.c:421
#14 0x80737c1 in loop (toplevel=1, justonce=0) at init.c:121
#15 0x8051752 in main (argc=2, argv=0xbffff784) at ./main.c:86
(gdb) 
-- 
Tanaka Akira