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`ConflictSet(const ConflictSet&)` and `operator=(const ConflictSet&)` were only deleted for C++11 and later. In C++98/C++03 the compiler implicitly generated public copy operations, so copying a ConflictSet shared the opaque `Impl*` and caused a double-free on destruction. Declare both operations private and leave them undefined when `__cplusplus <= 199711L`, matching the standard pre-C++11 idiom for move-only types. Guard the declarations with `defined(__cplusplus)` so they are not exposed to C90 compilation units. Closes #48