foo.cc: In function ‘int gcd(int, int)’:
foo.cc:14:25: warning: this ‘else’ clause does not guard... [-Wmisleading-indentation]
   14 |                         else
      |                         ^~~~
foo.cc:21:33: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the ‘else’
   21 |                                 return a;
      |                                 ^~~~~~