Run id: 115962

Main.cc: In function 'int z(int&, int&)':
Main.cc:9:22: error: invalid initialization of non-const reference of type 'int&' from an rvalue of type 'int'
     else return z(b,a%b);
                      ^
Main.cc:7:5: note:   initializing argument 2 of 'int z(int&, int&)'
 int z(int &a,int &b){
     ^