The best thing I can think of is introducing a temp variable:

void main(){
    double[3] v1 = [1.0, 2.0, 3.0];
    double[3] v2 = [2.0, 3.0, 4.0];

    double[3] v3 = v1[] + v2[];
    auto t1 = Test(v3);
}

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