foo.cc: In member function 'void LinkList::append(int)':
foo.cc:65:13: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   65 |             for(; tail->next!=NULL; tail=tail->next);
      |             ^~~
foo.cc:66:10: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   66 |          tail->next = newp;
      |          ^~~~

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