您使用的 Go 版本是什么（go version）？$ go version1.13最新版本是否會重現此問題？是的您使用什么操作系統和處理器架構（go env）？go env輸出$ go envGOEXE=""GOFLAGS=""GOHOSTARCH="amd64"GOHOSTOS="darwin"GONOPROXY=""GONOSUMDB=""GOOS="darwin"GOPATH="/Users/chezixin/go"GOPRIVATE=""GOPROXY="https://goproxy.io"GOROOT="/usr/local/go"GOSUMDB="sum.golang.org"GOTMPDIR=""GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"GCCGO="gccgo"AR="ar"CC="clang"CXX="clang++"CGO_ENABLED="1"GOMOD="/Users/chezixin/go/src/go.mod"CGO_CFLAGS="-g -O2"CGO_CPPFLAGS=""CGO_CXXFLAGS="-g -O2"CGO_FFLAGS="-g -O2"CGO_LDFLAGS="-g -O2"PKG_CONFIG="pkg-config"GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/mr/_x323k891dq9yvmvlgwqf4f40000gn/T/go-build490011880=/tmp/go-build -gno-record-gcc-switches -fno-common"你做了什么？package mainimport "fmt"type T struct {    Name  string    Port  int    State State}type State intconst (    Running State = iota    Stopped    Rebooting    Terminated)func (s State) String() string {    switch s {    case Running:        return "Running"    case Stopped:        return "Stopped"    case Rebooting:        return "Rebooting"    case Terminated:        return "Terminated"    default:        return "Unknown"    }}func main() {    t := T{Name: "example", Port: 6666}    fmt.Printf("t %+v\n", t)}結果：t {Name:example Port:6666 State:Running}您希望看到什么？