Zsh segfault with process substitution

["Eric P. Mangold" <eric@xxxxxxxxxxxx>]

Hi, I was just fooling around today and managed to segfault zsh in a way
that is reliable to reproduce. Some other folks on IRC were able to
reproduce on zsh 4.3.10 and recent git builds - on Linux and OpenBSD.

Sapphire ~/code % zsh
Sapphire ~/code % cat =(echo foo)
foo
Sapphire ~/code % cat tree=${:-=(echo 'C,D),(F,G)'}
zsh: oops.
zsh: segmentation fault (core dumped)  zsh

Let me know if I can be of further assistance.

    -teratorn