227                 SkASSERT(fTail && !(*fTail));  in append()
228                 *fTail = alloc->make<Node>(a, b, c);  in append()
229                 fTail = &(*fTail)->fNext;  in append()
235             SkASSERT(fTail && !(*fTail));  in concat()
237                 *fTail = list.fHead;  in concat()
238                 fTail = list.fTail;  in concat()
241                 list.fTail = &list.fHead;  in concat()
248         Node** fTail = &fHead;  variable
298     VertexList() : fHead(nullptr), fTail(nullptr) {}  in VertexList()
299     VertexList(Vertex* head, Vertex* tail) : fHead(head), fTail(tail) {}  in VertexList()
301     Vertex* fTail;  member
303     void append(Vertex* v) { insert(v, fTail, nullptr); }  in append()
308         if (fTail) {  in append()
309             fTail->fNext = list.fHead;  in append()
310             list.fHead->fPrev = fTail;  in append()
314         fTail = list.fTail;  in append()
319         if (fHead && fTail) {  in close()
320             fTail->fNext = fHead;  in close()
321             fHead->fPrev = fTail;  in close()
436     EdgeList() : fHead(nullptr), fTail(nullptr) {}  in EdgeList()
438     Edge* fTail;  member
441     void append(Edge* e) { insert(e, fTail, nullptr); }  in append()
449         if (fHead && fTail) {  in close()
450             fTail->fRight = fHead;  in close()
451             fHead->fLeft = fTail;  in close()
480     Vertex* lastVertex() const { return fTail ? fTail->fLastEdge->fBottom : fFirstVertex; }  in lastVertex()
484     MonotonePoly* fTail;  member