帮我看看错误

#include<iostream>
using namespace std;
class complex
{
private:
int real;
int imag;
public:
friend complex operator+(complex &a,complex &b);
void set(int r,int i);
void display();

};
complex operator +(complex &a,complex &b)
{ complex temp;
temp.real=a.real+b.real;
temp.imag=a.imag+b.imag;
return temp;
}
void complex::set(int r,int i)
{real=r;
imag=i;}
void complex::display()
{cout<<real<<"+"<<imag<<"i"<<endl;}
int main()
{
complex c1,c2,c3;
c1.set(1,1);
c2.set(2,1);
c3.set(0,0);
c3=c1+c2;
c3.display();
return 0;
}
运行不正确，编译器报的错是
fatal error C1001: INTERNAL COMPILER ERROR
(compiler file 'msc1.cpp', line 1786)
Please choose the Technical Support command on the Visual C++
Help menu, or o

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