# Proposed Wording Change to the Error Terminology (II)

When you read this, take out your chapter 1 and read the rest of the
section on error terminology. The suggestions about using the term
portable'' as part of the definition of undefined'' seem to have been
made under the influence of amnesia regarding the rest of the section.

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When situation $S$ occurs, the results are undefined.''

This terminology has the following meaning:

\beginlist

\item{\bull} If this situation occurs, the results are unpredictable.  The
results may range from harmless to fatal.

\item{\bull} No valid program should cause this situation to happen.

\item{\bull} Implementations are allowed to detect this situation and
signal an error, but no implementation is required to detect the
situation.

\item{\bull} No implementation is allowed to extend the semantics of the
\OS\ to this situation.

\endlist

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-rpg-