(ENV) 🍺 /Users/go/src/github.com/etcd-io/etcd ☞ git:(test) ✗ ./bin/etcd version
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x135b7ce]

goroutine 1 [running]:
go.uber.org/zap.(*Logger).check(0x0, 0x1, 0x1c5d90a, 0x16, 0xc000091800)
	/Users/go/src/github.com/etcd-io/etcd/vendor/go.uber.org/zap/logger.go:263 +0x90e
go.uber.org/zap.(*Logger).Warn(0x0, 0x1c5d90a, 0x16, 0xc000091800, 0x1, 0x1)
	/Users/go/src/github.com/etcd-io/etcd/vendor/go.uber.org/zap/logger.go:194 +0x44
go.etcd.io/etcd/v3/etcdmain.startEtcdOrProxyV2()
	/Users/go/src/github.com/etcd-io/etcd/etcdmain/etcd.go:61 +0x327
go.etcd.io/etcd/v3/etcdmain.Main()
	/Users/go/src/github.com/etcd-io/etcd/etcdmain/main.go:46 +0x37
main.main()
	/Users/go/src/github.com/etcd-io/etcd/main.go:28 +0x20

(ENV) ➜ /Users/go/src/github.com/etcd-io/etcd ☞ git:(test) ✗ ./bin/etcd --version
etcd Version: 3.5.0-pre
Git SHA: 9b6c3e337
Go Version: go1.14.3
Go OS/Arch: darwin/amd64

 52 func startEtcdOrProxyV2() {
 53     grpc.EnableTracing = false
 54
 55     cfg := newConfig()
 56     defaultInitialCluster := cfg.ec.InitialCluster
 57
 58     err := cfg.parse(os.Args[1:])
 59     lg := cfg.ec.GetLogger()
 60     if err != nil {
 61         lg.Warn("failed to verify flags", zap.Error(err))
 62         switch err {
 63         case embed.ErrUnsetAdvertiseClientURLsFlag:
 64             lg.Warn("advertise client URLs are not set", zap.Error(err))
 65         }
 66         os.Exit(1)
 67     }