https://github.com/bitcoin/bitcoin/blob/68f3c7eb080e461cfeac37f8db7034fe507241d0/src/prevector.h#L152-L158

I'm opening an issue as its fix is too tiny to become a pull request.

Can be solved by renaming the struct to
```c
     struct indirect_contents { 
         size_type capacity; 
         char* indirect; 
     }; 
```
const CChainParams& chainparams,
    BlockValidationState &state,
    FlushStateMode mode,
    int nManualPruneHeight)
{
    LOCK(cs_main);
    assert(this->CanFlushToDisk());
    static int64_t nLastWrite = 0;
    static int64_t nLastFlush = 0;
    std::set<int> setFilesToPrune;
    bool full_flush_completed = false;
    const size_t coins_count = CoinsTip().GetCacheSize();
    const size_t coins_mem_usage = CoinsTip().DynamicMemoryUsage();
    try {
    {
        bool fFlushForPrune = false;
        bool fDoFullFlush = false;
        CoinsCacheSizeState cache_state = GetCoinsCacheSizeState(::mempool);
        LOCK(cs_LastBlockFile);
        if (fPruneMode && (fCheckForPruning || nManualPruneHeight > 0) && !fReindex) {
            if (nManualPruneHeight > 0) {
                LOG_TIME_MILLIS("find files to prune (manual)", BCLog::BENCH);
                FindFilesToPruneManual(setFilesToPrune, nManualPruneHeight);
            } else {
                LOG_TIME_MILLIS("find files to prune", BCLog::BENCH);
                FindFilesToPrune(setFilesToPrune, chainparams.PruneAfterHeight());
                fCheckForPruning = false;
            }
            if (!setFilesToPrune.empty()) {
                fFlushForPrune = true;