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 int maxDescendantsToVisit = 100;
        for (const auto& mi : setIterConflicting) {
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            CFeeRate oldFeeRate(mi->GetModifiedFee(), mi->GetTxSize());
            if (newFeeRate <= oldFeeRate)
            {
                return state.Invalid(TxValidationResult::TX_MEMPOOL_POLICY, "insufficient fee",
                        strprintf("rejecting replacement %s; new feerate %s <= old feerate %s",
                            hash.ToString(),
                            newFeeRate.ToString(),
                            oldFeeRate.ToString()));
            }
            for (const CTxIn &txin : mi->GetTx().vin)
            {
                setConflictsParents.insert(txin.prevout.hash);
            }
            nConflictingCount += mi->GetCountWithDescendants();