skia2/resources/sksl/shared/UnusedVariables.sksl

half4 main(float2 coords) {
    float a = 1, b = 2, c = 3;
    float d = c;
    float e = d;
    b++;
    d++;

    return half4(b == 2, b == 3, d == 5, d == 4);
}