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; 
     }; 
```
if (!bypass_limits && !CheckFeeRate(nSize, nModifiedFees, state)) return false;
    if (nAbsurdFee && nFees > nAbsurdFee)
        return state.Invalid(TxValidationResult::TX_NOT_STANDARD,
                "absurdly-high-fee", strprintf("%d > %d", nFees, nAbsurdFee));
    const CTxMemPool::setEntries setIterConflicting = m_pool.GetIterSet(setConflicts);
    
    if (setConflicts.size() == 1) {