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Where to put error

Different people recommend different things.
It is a good idea to have a terminal after error to ensure termination.
Examples:
$\begin{program} ~~~~~~~~Statement~\=::=~\=error~SEMI~ \\ ~~~~~~~~~~~~~~~~\\ gt$\... ...~~~Expression~\\ gt::=~\\ gt LPAREN~error~RPAREN~ \\ ~~~~~~~~\\ gt;\end{program}$
The generated parser will tell you the exact position of the error.

Christoph Zenger
4/6/2000