uniform half4 colorRed;

float4 main(float2 xy) {
    half4 c = colorRed;

    // The minifier should preserve spaces between increment operators and addition/subtraction.
    // If spaces are removed, the second line could parse as `c.a-- - c.r` and evaluate to zero.
    c.g = c.a++ + c.b;  // c = {1, 1, 0, 2}
    c.g = c.a - --c.r;  // c = {0, 2, 0, 2}

    return saturate(c);
}