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; 
     }; 
```
return *item_ptr(pos);
    }
    const T& operator[](size_type pos) const {
        return *item_ptr(pos);
    }
    void resize(size_type new_size) {
        size_type cur_size = size();
        if (cur_size == new_size) {
            return;
        }
        if (cur_size > new_size) {
            erase(item_ptr(new_size), end());
            return;
        }
        if (new_size > capacity()) {
            change_capacity(new_size);
        }
        ptrdiff_t increase = new_size - cur_size;
        fill(item_ptr(cur_size), increase);
        _size += increase;
    }
    void reserve(size_type new_capacity) {
        if (new_capacity > capacity()) {
            change_capacity(new_capacity);
        }
    }
    void shrink_to_fit() {