/in/foo.cc:11:1: warning: multi-line comment [-Wcomment]
   11 | //                                                     | \__ \
      | ^
/in/foo.cc:118:38: error: macro "double_bird_chirp" passed 2 arguments, but takes just 1
  118 |         double_bird_chirp("%s", a + b);
      |                                      ^
/in/foo.cc:111: note: macro "double_bird_chirp" defined here
  111 | #define double_bird_chirp(a) printf(a)
      | 
/in/foo.cc: In function 'int main()':
/in/foo.cc:118:9: error: 'double_bird_chirp' was not declared in this scope
  118 |         double_bird_chirp("%s", a + b);
      |         ^~~~~~~~~~~~~~~~~