foo.cc: In member function 'void LinkList<T>::Append(T)':
foo.cc:106:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  106 |   for (tail = head; tail->next != NULL; tail = tail->next);
      |   ^~~
foo.cc:107:4: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  107 |    tail->next = newp;
      |    ^~~~

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