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The <code>ERROR</code> macro takes one argument: text to display to the standard error
stream. The current input file and line number are also displayed. After
displaying the text, the <code>yodl</code> program aborts with an exit status of 1.

This command can be used, e.g., in a macro package when an incorrect macro is
expanded. In my macro package (see chapter ??) the <code>ERROR</code>
macro is used when the sectioning command <code>chapter()</code> is used in an
<code>article</code> document (in the package, <code>chapter</code>'s are only available in
<code>book</code>s or <code>report</code>s).

An analogous builtin macro is <code>WARNING</code>, which also prints a message but 
does not exit (see section ??).
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Copyright (c) 1997, 1998, 1999 Karel Kubat and Jan Nieuwenhuizen.

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Verbatim copying and distribution of this entire article is 
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