View Compilation Error

0_0_11861845_18531.cpp
VC\include\xtree(992) : error C3848: 具有类型“const cmp”的表达式会丢失一些 const-volatile 限定符以调用“bool cmp::operator ()(const int &,const int &)”
        VC\include\xtree(987) : 编译类模板成员函数“std::_Tree<_Traits>::_Nodeptr std::_Tree<_Traits>::_Lbound(const std::_Tree<_Traits>::key_type &) const”时
        with
        [
            _Traits=std::_Tset_traits<int,cmp,std::allocator<std::_Tree<std::_Tmap_traits<int,std::string,std::less<int>,std::allocator<std::pair<const int,std::string>>,false>>::key_type>,false>
        ]
        VC\include\set(57) : 参见对正在编译的类模板实例化“std::_Tree<_Traits>”的引用
        with
        [
            _Traits=std::_Tset_traits<int,cmp,std::allocator<std::_Tree<std::_Tmap_traits<int,std::string,std::less<int>,std::allocator<std::pair<const int,std::string>>,false>>::key_type>,false>
        ]
        0_0_11861845_18531.cpp(255) : 参见对正在编译的类模板实例化“std::set<_Kty,_Pr>”的引用
        with
        [
            _Kty=int,
            _Pr=cmp
        ]