foo.cc: In function ‘int IsPrime(int)’:
foo.cc:6:9: warning: this ‘for’ clause does not guard... [-Wmisleading-indentation]
    6 |         for (int i=2;i*i<=n;i++)
      |         ^~~
foo.cc:8:17: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the ‘for’
    8 |                 return 1;
      |                 ^~~~~~