GNU Info

(as.info)Fail

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`.fail EXPRESSION'
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   Generates an error or a warning.  If the value of the EXPRESSION is
500 or more, `as' will print a warning message.  If the value is less
than 500, `as' will print an error message.  The message will include
the value of EXPRESSION.  This can occasionally be useful inside
complex nested macros or conditional assembly.