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The latest version of this topic can be found at C28022.

warning C28022: The function class(es) <classlist1> on this function do not match the function class(es) <classlist2> on the typedef used to define it.

This warning is reported when there is an error in the annotations. Both the typedef and the function itself have _Function_class_ annotations, but they do not match. If both are used they must match.