/in/foo.cc:1:1: error: stray '@' in program
 @todo https://www.cnblogs.com/happyZYM/p/11380170.html
 ^
/in/foo.cc:1:2: error: 'todo' does not name a type
 @todo https://www.cnblogs.com/happyZYM/p/11380170.html
  ^~~~