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From: Mark Carroll <mtbc@bcs.org>
Newsgroups: comp.lang.postscript
Subject: Re: Unbalanced [
Date: Wed, 11 Sep 2013 17:28:12 +0100
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anavi8r@gmail.com writes:

> Is this normal? How should this be treated by a PostScript interpreter?

[ just pushes a mark onto the stack. I guess that procedures that look
back on the stack for the mark might find it useful, like counttomark. 
] looks back for the mark to pop the elements for putting into an array.
All marks are the same, they're usually used as a delimiter for the end
of a list for consumption by something else.

-- Mark