View Compilation Error

0_0_33833171_6506.cpp:970:8: error: specialization of 'std::is_integral<BigInteger>' after instantiation
 struct is_integral<BigInteger> : public true_type {
        ^
0_0_33833171_6506.cpp:970:8: error: redefinition of 'struct std::is_integral<BigInteger>'
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/move.h:57:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_pair.h:59,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/utility:70,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:60,
                 from 0_0_33833171_6506.cpp:7:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:257:12: error: previous definition of 'struct std::is_integral<BigInteger>'
     struct is_integral
            ^