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From: Rich Salz <rsalz@bbn.com>
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Date: Fri, 27 Sep 1991 08:29:11 -0500
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To: malte@techfak.uni-bielefeld.de, rc@archone.tamu.edu
Subject: Re:  export of variables and functions

Byron and I have exchanged messages about this.  He rightly says that
the default must be to export something, rather than not export it
otherwise old scripts will break.

My idea of unexporting is to have a variable that names the variables to
not be exported.  This seems better then having two new commands, export
and unexport, and makes the "is this variable exported?" test very easy to
write.

fn local { unexported=( $unexported $* ) }
	/r$