/in/foo.cc: In function 'int main()':
/in/foo.cc:9:13: error: redeclaration of 'int a'
    9 |         int a=aa,b=bb;
      |             ^
/in/foo.cc:5:25: note: 'int a' previously declared here
    5 |         int b1,a1,b2,a2,a,b,aa,bb,r;
      |                         ^
/in/foo.cc:9:18: error: redeclaration of 'int b'
    9 |         int a=aa,b=bb;
      |                  ^
/in/foo.cc:5:27: note: 'int b' previously declared here
    5 |         int b1,a1,b2,a2,a,b,aa,bb,r;
      |                           ^