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< operator<<(ostream &out, const m5::hash_map<KEY, VALUE> &map)
---
> operator<<(ostream &out, const std::unordered_map<KEY, VALUE> &map)
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< typename m5::hash_map<KEY, VALUE>::const_iterator i = map.begin();
< typename m5::hash_map<KEY, VALUE>::const_iterator end = map.end();
---
> auto i = map.begin();
> auto end = map.end();