View Compilation Error

In file included from GCC4.9.2/x86_64-w64-mingw32/include/crtdefs.h:10:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/wchar.h:9,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/cwchar:44,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/postypes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iosfwd:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_16589993_2524.cpp:1:
0_0_16589993_2524.cpp: In function 'int main()':
0_0_16589993_2524.cpp:31:16: error: expected primary-expression before 'long'
    __int64 b = __int64(a);
                ^