foo.cc: In function 'Node* SetUnion(Node*, Node*)':
foo.cc:50:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   50 |         for (Node* p = head; p != NULL; p = p->next)
      |         ^~~
foo.cc:53:17: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   53 |                 return head1;
      |                 ^~~~~~

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