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From: iwm@doc.ic.ac.uk (Ian Moor)
Newsgroups: comp.lang.pascal,comp.bugs.misc
Subject: pxp and null
Message-ID: <252@gould.doc.ic.ac.uk>
Date: 8 Apr 88 19:33:29 GMT
Sender: news@doc.ic.ac.uk
Reply-To: iwm@doc.ic.ac.uk (Ian Moor)
Organization: Dept. of Computing, Imperial College, London, UK.
Lines: 20

The pxp  BSD Pascal prettyprinter inserts the word `null' in places
where a null statement is legal : if B then P else; becomes 
if B then P else null;. Null is not a legal Pascal statement and
causes non BSD Pascal processing tools to complain, (eg. ptc : Pascal to
C converter). As pxp has an {\HUGE FLAME undocumented} switch -O for
removing `others' in case statements it is used in compiling TeX --
and the Tangle  preprocessor generates statements with null cases that
get mangled as described above.



Ian W Moor
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