C:\Dev\STL\playground>type main.cpp
template<int>
struct test {
    int i;
     [[nodiscard]] friend bool operator==(const test& lhs, const test& rhs) {
        return lhs.i == rhs.i;
    }
};

int main() {
    test<1> t1{1};
    test<1> t2{1};
    t1 == t2;
}

C:\Dev\STL\playground>nvcc main.cpp
main.cpp
main.cpp(12): warning C4834: discarding return value of function with [[nodiscard]] attribute

C:\Dev\STL\playground>nvcc --version
nvcc: NVIDIA (R) Cuda compiler driver
Copyright (c) 2005-2024 NVIDIA Corporation
Built on Tue_Feb_27_16:28:36_Pacific_Standard_Time_2024
Cuda compilation tools, release 12.4, V12.4.99
Build cuda_12.4.r12.4/compiler.33961263_0