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Crash when capturing command output in completion

Using the latest sources, I'm getting a crash during completion with
capturing command output.

$ installed_packages


apel build c-support calc cc-mode cedet-common debug dired easypg ecb
ecrypto edebug ediff edit-utils efs eieio elib emerge fsf-compat
general-docs gnus ibuffer igrep ilisp ispell mail-lib mmm-mode
net-utils os-utils pc pcl-cvs perl-modes pgg prog-modes ps-print psgml
psgml-dtds python-modes re-builder ruby-modes semantic sgml sh-script
speedbar supercite texinfo text-modes tramp vc xemacs-base

$ scm_update $(installed_<TAB>


  scm_update $(installed_packages )<TAB>

==> Boom!  My terminal emulator disappeared.
==> Here is the backtrace:

gdb /opt/zsh-2015-01-15-1337/bin/zsh core
GNU gdb (Ubuntu 7.7.1-0ubuntu5~14.04.2) 7.7.1
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
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Reading symbols from /opt/zsh-2015-01-15-1337/bin/zsh...done.
[New LWP 4891]
Core was generated by `/opt/zsh-2015-01-15-1337/bin/zsh -l'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007fa93238cd40 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
(gdb) bt
#0  0x00007fa93238cd40 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007fa930d66d6a in callcompfunc (s=0x7fa933009ff0 "installed_packages",
    fn=0x1aaaa90 "_main_complete") at compcore.c:743
#2  0x00007fa930d67ced in makecomplist (s=0x7fa933009ff0
"installed_packages", incmd=0, lst=0)
    at compcore.c:989
#3  0x00007fa930d65915 in do_completion (dummy=0x7fa9313dcb48 <zlehooks+40>,
    dat=0x7fff21af6710) at compcore.c:349
#4  0x00000000004682ac in runhookdef (h=0x7fa9313dcb48 <zlehooks+40>,
    at module.c:996
#5  0x00007fa9311c22ed in docompletion (s=0x1af0d08
"\205installed_packages", lst=0, incmd=0)
    at zle_tricky.c:2282
#6  0x00007fa9311bda42 in docomplete (lst=0) at zle_tricky.c:866
#7  0x00007fa9311bc345 in expandorcomplete (args=0x7fa9313dd0c8 <zlenoargs>)
    at zle_tricky.c:315
#8  0x00007fa9311bbf2a in completecall (args=0x7fa9313dd0c8
<zlenoargs>) at zle_tricky.c:208
#9  0x00007fa9311a9502 in execzlefunc (func=0x7fa9313d96a0 <thingies+1920>,
    args=0x7fa9313dd0c8 <zlenoargs>, set_bindk=0) at zle_main.c:1345
#10 0x00007fa9311a86d6 in zlecore () at zle_main.c:1066
#11 0x00007fa9311a9060 in zleread (lp=0x6dbcf0 <prompt>, rp=0x0,
flags=3, context=0,
    init=0x7fa9311cf14d "zle-line-init", finish=0x7fa9311cf13d
    at zle_main.c:1253
#12 0x00007fa9311abb65 in zle_main_entry (cmd=1, ap=0x7fff21af6cf8) at
#13 0x000000000044f2a0 in zleentry (cmd=1) at init.c:1516
#14 0x0000000000450197 in inputline () at input.c:287
#15 0x000000000045000b in ingetc () at input.c:221
#16 0x0000000000443699 in ihgetc () at hist.c:361
#17 0x0000000000459b4a in gettok () at lex.c:583
#18 0x0000000000459322 in zshlex () at lex.c:264
#19 0x000000000047c78f in parse_event (endtok=37) at parse.c:538
#20 0x000000000044bd75 in loop (toplevel=1, justonce=0) at init.c:145
#21 0x000000000044f794 in zsh_main (argc=2, argv=0x7fff21af7088) at init.c:1671
#22 0x000000000040e82d in main (argc=2, argv=0x7fff21af7088) at ./main.c:93

I cannot reproduce this in a zsh started with "-f", so this has
something to do with my customizations.  Can anyone else reproduce

Thank you,

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