[pstricks] Bug: pst-tree generates invalid PostScript code

[Edward Avis]

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I've found that certain characters in node labels and the like can cause
pst-tree to generate PostScript specials which crash the PostScript
interpreter.  Minimal test case:

\documentclass{article}
\usepackage{pst-tree}
\begin{document}
\pstree{\TC[name=()]}{}
\end{document}

This runs through 'latex' and 'dvips' just fine but the resulting PS
file is not valid.  Replacing the () characters with something like 'ab'
works fine.

IMHO pstricks ought to quote these characters in some way so that they
don't cause PostScript syntax errors - or at least give a warning when
processing the file.

- -- 
Ed Avis <epa98 at doc.ic.ac.uk>
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