uniform half4 colorGreen, colorRed;

const float3x3 values = float3x3(1);

inline float3 indexMatrix(int index) {
    return values[index];
}

half4 main(float2 coords) {
    float3 ok = indexMatrix(0) + indexMatrix(1) + indexMatrix(2);
    float3 undefined = indexMatrix(-1) + indexMatrix(3);
    return colorGreen;
}

/*%%*
index -1 out of range for 'float3x3'
index 3 out of range for 'float3x3'
*%%*/