[prog] Yacc - double errors

[Jimen Ching]

On Tue, 10 Feb 2004, Sue Stones wrote:
>Having written this helped clear my head.  Re reading the book, and doing
>things diferently has shown that this is exactally what happend.  Using
>the error token actually calls yyerror.

Yes, yyerror is called when a syntactic error is detected.  You only need
to manually call yyerror for semantic errors, or contextual problems.
Yacc can only verify the input stream conforms to your grammar, nothing
more.

--jc
-- 
Jimen Ching (WH6BRR)      jching at flex.com     wh6brr at uhm.ampr.org