foo.cc: In function 'int MonthDay(int, int)':
foo.cc:29:2: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
  else 
  ^~~~
foo.cc:32:3: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'else'
   return day;
   ^~~~~~