private static long CallForSplitStructWithFourLongs(int arg0, int arg1, StructWithFourLongs splitArg) => splitArg.LongOne;
private static bool ProblemWithPromotedStruct_Unix_x64(StructWithFourLongs b) { var c = b; return(CallForDblStructs(default, default, default, default, *(DblLngStruct *)&c) != c.LongTwo);