Method DescribeNegationTo

tests/gtest/gtest.h:9098–9100

  void DescribeTo(::std::ostream* os) const override { impl_->DescribeTo(os); }

  void DescribeNegationTo(::std::ostream* os) const override {
    impl_->DescribeNegationTo(os);
  }

  bool MatchAndExplain(const T& x,
                       MatchResultListener* listener) const override {