foo.cc: In member function 'void PolyLinkList::Append(PolyLinkNode&)':
foo.cc:49:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   49 |   for( ;tail->next!=NULL; tail=tail->next);
      |   ^~~
foo.cc:50:4: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   50 |    tail->next = newp;
      |    ^~~~

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