In file included from /in/driver/main.cpp:5:0:
/in/hashtable.hpp: In instantiation of 'size_t HashTable<Key, Value, Hash, KeyEqual>::hashKey(const Key&) const [with Key = int; Value = int; Hash = std::hash<int>; KeyEqual = std::equal_to<int>; size_t = long unsigned int]':
/in/hashtable.hpp:298:29:   required from 'HashTable<Key, Value, Hash, KeyEqual>::Iterator HashTable<Key, Value, Hash, KeyEqual>::find(const Key&) [with Key = int; Value = int; Hash = std::hash<int>; KeyEqual = std::equal_to<int>]'
/in/driver/main.cpp:101:34:   required from here
/in/hashtable.hpp:159:12: error: unused variable 'bucsize' [-Werror=unused-variable]
     size_t bucsize = buckets.size();
            ^~~~~~~
cc1plus: all warnings being treated as errors