I get warning 401 which is noted in the documentation to be largely benign.
example.i:18: Warning(401): Nothing known about base class 'Foo'. Ignored.
What I would like to do, is filter that warning, but only for all classes that derive from base class Foo, and only with regard to base class Foo. Is there a warnfilter syntax which will do that for me? Or another approach?
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