/in/foo.cc: In function 'int perb(int, int)':
/in/foo.cc:7:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  if(n == 0);
  ^~
/in/foo.cc:8:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
   return 1;
   ^~~~~~