bison @n constructs

Jay Scott <>
Fri, 8 Sep 1995 21:19:01 GMT

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Newsgroups: comp.compilers
From: Jay Scott <>
Keywords: question, yacc
Organization: Compilers Central
Date: Fri, 8 Sep 1995 21:19:01 GMT

Every time I get a version of bison, I see the mentions of the @n
(also known as guards?) construction. But I see nothing on how to
USE them. Can anybody give me an example? My (by now ancient) bison
source code didn't actually support the construct as near as I can
tell -- ie, the lexer and so forth wouldn't recognize them as having
any special properties. So I'd assumed this was a never-implemented
and not fully abandoned feature. But I see other posters saying they
USE them. I'll play the fool -- HOW? j.


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