36     Segment *Next;  member
107       DCHECK_NE(S->Next, &SentinelSegment);
108       S = S->Next;
234       Freelist = Freelist->Next;  in NewSegment()
243       FreeSegment->Next = &SentinelSegment;  in NewSegment()
268     DCHECK_EQ(S->Next, &SentinelSegment);  in InitHeadAndTail()
274     DCHECK_EQ(Tail->Next, &SentinelSegment);  in InitHeadAndTail()
284     DCHECK_EQ(Tail->Next, &SentinelSegment);  in AppendNewSegment()
286     DCHECK_EQ(S->Next, &SentinelSegment);  in AppendNewSegment()
288     Tail->Next = S;  in AppendNewSegment()
290     DCHECK_EQ(S, S->Prev->Next);  in AppendNewSegment()
291     DCHECK_EQ(Tail->Next, &SentinelSegment);  in AppendNewSegment()
419       S = S->Next;
517       DCHECK_EQ(Tail->Next, &SentinelSegment);  in trim()
557         SPT->Next = &SentinelSegment;  in trim()
559         Tail->Next = Freelist;  in trim()
564         DCHECK_EQ(Tail->Next, &SentinelSegment);  in trim()
599         ST->Next = Freelist;  in trim()
601         SPT->Next = &SentinelSegment;  in trim()
606         DCHECK_EQ(Tail->Next, &SentinelSegment);  in trim()
608         DCHECK_EQ(Freelist->Next->Prev, Freelist);  in trim()
623         (Freelist == &SentinelSegment && Tail->Next == &SentinelSegment));  in trim()