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Without this, use of this copy ctor is deprecated in C++11 due to the presence of a user-declared dtor. Marking the class final is just a little extra security that there are no further derived classes that may then end up using the intermediate base class's copy assignment operator and cause slicing to occur. I didn't bother marking the other (non-test) base class final, since it has reference members so it won't have any implicit assignment operators anyway. Open to ideas on that, though. We probably want a warning about use of a slicing assignment operator, then I wouldn't worry so much about marking the class as final. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231114 91177308-0d34-0410-b5e6-96231b3b80d8
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