友元函数重载出错，求解

#include<iostream>
using namespace std;
class space
{
    int x;
    int y;
    int z;
public:
    space()
    {
        x=1;
        y=1;
        z=1;
    }
    friend void operator-(space &s)//编译时提示这儿有错
    {
        s.x=-s.x;
        s.y=-s.y;
        s.z=-s.z;
    }
    void dispaly()
    {
        cout<<x<<y<<z<<endl;
    }
};

int main()
{
    space p;
    -p;
    p.dispaly ();
    return 0;

}fatal error C1001: INTERNAL COMPILER ERROR
        (compiler file 'msc1.cpp', line 1786)
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