/in/foo.cc: In function 'int main()':
/in/foo.cc:17:9: error: 'r' was not declared in this scope
   17 |         r
      |         ^
/in/foo.cc:17:10: error: expected '}' at end of input
   17 |         r
      |          ^
/in/foo.cc:3:12: note: to match this '{'
    3 | int main() {
      |            ^