In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/utility:70:0,
from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:60,
from 0_0_30587369_2129.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_pair.h: In instantiation of 'struct std::pair<const char, Node>':
GCC4.9.2/x86_64-w64-mingw32/include/c++/ext/aligned_buffer.h:44:34: required from 'struct __gnu_cxx::__aligned_buffer<std::pair<const char, Node> >'
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/hashtable_policy.h:249:43: required from 'struct std::__detail::_Hash_node_value_base<std::pair<const char, Node> >'
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/hashtable_policy.h:295:12: required from 'struct std::__detail::_Hash_node<std::pair<const char, Node>, false>'
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/hashtable_policy.h:1899:60: required from 'struct std::__detail::_Hashtable_alloc<std::allocator<std::__detail::_Hash_node<std::pair<const char, Node>, false> > >'
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/hashtable.h:170:11: required from 'class std::_Hashtable<char, std::pair<const char, Node>, std::allocator<std::pair<const char, Node> >, std::__detail::_Select1st, std::equal_to<char>, std::hash<char>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true> >'
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/unordered_map.h:101:18: required from 'class std::unordered_map<char, Node>'
0_0_30587369_2129.cpp:33:31: required from here
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_pair.h:102:11: error: 'std::pair<_T1, _T2>::second' has incomplete type
_T2 second; /// @c second is a copy of the second object
^
0_0_30587369_2129.cpp:29:7: error: forward declaration of 'class Node'
class Node {
^
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