SKIPPED:BUG:MISSINGARG in MsQuic Logs

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I was just looking at a log generated from the MsQuic CI and I found this line (for an assert):

[0][][04:09:46.617630][ lib] ASSERT, 421:"/home/vsts/work/1/s/src/platform/platform_linux.c"<SKIPPED:BUG:MISSINGARG:arg4:ANSI_String>.

This maps to the following code:

void
QuicPlatformLogAssert(
    _In_z_ const char* File,
    _In_ int Line,
    _In_z_ const char* Expr
    )
{
    QuicTraceEvent(
        LibraryAssert,
        "[ lib] ASSERT, %u:%s - %s.",
        (uint32_t)Line,
        File,
        Expr);
}

That is triggered by this macro:

#define QUIC_FRE_ASSERT(exp) ((exp) ? (void)0 : (QuicPlatformLogAssert(__FILE__, __LINE__, #exp), quic_bugcheck()));

I don't know why clog would claim the arg is missing. I suspect a CLOG bug. The artifacts can be found here (for now): https://dev.azure.com/ms/msquic/_build/results?buildId=99107&view=artifacts&type=publishedArtifacts

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Still reproing on the latest msquic using clog 0.1.6.