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How to add "error"

From: Tamas Nagy
Subject: How to add "error"
Date: Tue, 10 Apr 2007 15:17:35 -0700 (PDT) 
Hi!

I cannot understand something:
how to add error when "empty" is allowed

Nodes:  Apple
      | Pear
      |  /* empty */

Then how to add 'error' to the above rule?

 Nodes:  Apple
      | Pear
      |  /* empty */
      |  error     { printf("Error") }   ?????

Tamas






       
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