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Using 'variable' from failed function call at line 'location'.
Remarks
This warning is reported instead of C6001 when a variable isn't set because it was marked as an _Out_ parameter on a prior function call that failed.
The problem might be that the prior called function isn't fully annotated. It may require _Always_, _Outptr_result_nullonfailure_ (_COM_Outptr_ for COM code), or a related annotation.