* If the line_number is -1, we don't change the current logical line
* number. If it is -2, we decrement the logical line number (this is
* to support the .appfile pseudo-op inserted into the stream by
* If the line_number is -1, we don't change the current logical line
* number. If it is -2, we decrement the logical line number (this is
* to support the .appfile pseudo-op inserted into the stream by