Variable name is not printed on the error message when it is uninitialized

[jkwak-work]

There is a case where the variable name is not printed with the error message.
It seems to be related to for loop and [unroll] doesn't help.

//TEST_INPUT:ubuffer(data=[2.0 1.0 5.0 2.0 1.0 -4.0 -5.0 4.0], stride=4):name=gInput
RWStructuredBuffer<float> gInput;

//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=outputBuffer
RWStructuredBuffer<float> outputBuffer;

int test(int inVal)
{
    return inVal;
}

[Shader("compute")]
[NumThreads(4, 1, 1)]
void computeMain(int3 dispatchThreadID : SV_DispatchThreadID)
{
    int tid = dispatchThreadID.x;
    int inVal;// = tid;
    for (int i = 0; i <2; ++i)
    {
        int outVal = test(inVal);
        outputBuffer[tid] = outVal;
    }
}

The error message for the code above is following,

$ slangc.exe repro.slang
repro.slang(29): warning 41016: use of uninitialized variable ''
    int outVal = test(inVal);
                     ^

Note that if you comment out the line of for loop, the error message properly prints the variable name,

repro.slang(29): warning 41016: use of uninitialized variable 'inVal'
    int outVal = test(inVal);
                     ^

When debugged, the instance is "kIROp_Undefined" and it doesn't have any name as if it is synthesized for implicit type casting or something.

[csyonghe]

There is now a findBestSourceLocFromUses function that you can call on the undef inst to report a better location.