111   auto it = free_by_start_.empty()  in Alloc()  local
114   if (it != free_by_size_.end()) {  in Alloc()
115     old_chunk = *it->second;  in Alloc()
116     RemoveChunk(&free_by_start_, &free_by_size_, it);  in Alloc()
173   auto it = free_by_start_.lower_bound(chunk);  in Free()  local
174   if (it != free_by_start_.begin()) {  in Free()
175     auto prev = it;  in Free()
188   if (it != free_by_start_.end()) {  in Free()
189     CHECK_LE(chunk.End(), it->Start());  in Free()
190     if (chunk.End() == it->Start()) {  in Free()
192       chunk.size += it->size;  in Free()
193       auto erase_pos = free_by_size_.find(FreeBySizeEntry { it->size, it });  in Free()