autocompletion is broken in restricted shell

[Jan Kryl <jan.kryl@nexenta.com>]

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Hi,

after we updated zsh to 5.3 autocompletion stopped to work for us in restricted
shell. This is mainly due to "38692: IFS can't be changed in restricted mode”.
I suppose there is a good reason why setting IFS is not allowed in restricted mode
even though that it’s not apparent to me.

However at least I would like to fix another thing which breaks autocompletion and
that is using write redirections in autocompletion code. That can be avoided by using
2>&- instead of 2>/dev/null. A patch for review is attached.

thanks
-Jan


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--- a/Completion/compinit    Mon May  8 12:51:31 2017
+++ b/Completion/compinit    Mon May  8 12:51:40 2017
@@ -168,7 +168,7 @@
              _comp_caller_options=(${(kv)options[@]});
              setopt localoptions localtraps localpatterns ${_comp_options[@]};
              local IFS=$'\'\ \\t\\r\\n\\0\'';
-             builtin enable -p \| \~ \( \? \* \[ \< \^ \# 2>/dev/null;
+             builtin enable -p \| \~ \( \? \* \[ \< \^ \# 2>&-;
              exec </dev/null;
              trap - ZERR;
              local -a reply;