llvm-project/clang/test/SemaCXX/unused.cpp

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// RUN: clang-cc -fsyntax-only -verify %s
// PR4103 : Make sure we don't get a bogus unused expression warning
class APInt {
char foo;
};
class APSInt : public APInt {
char bar;
public:
APSInt &operator=(const APSInt &RHS);
};
APSInt& APSInt::operator=(const APSInt &RHS) {
APInt::operator=(RHS);
return *this;
}