as: Error

1 
1 7.29 '.error "STRING"'
1 ======================
1 
1 Similarly to '.err', this directive emits an error, but you can specify
1 a string that will be emitted as the error message.  If you don't
1 specify the message, it defaults to '".error directive invoked in source
1 file"'.  ⇒Error and Warning Messages Errors.
1 
1       .error "This code has not been assembled and tested."
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