[Rd] is it a typo?

Liaw, Andy andy_liaw at merck.com
Tue Sep 14 16:28:31 CEST 2004

In ?options:

     'warning.expression': an R code expression to be called if a
          warning is generated, replacing the standard message.  If
          non-null is called irrespective of the value of option

Is there a missing `it' between `non-null' and `is'?


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