相关疑难解决方法(0)

我用谷歌搜索但没有回答.可能吗？如果是的话,该怎么办？

Go Playground链接:https://play.golang.org/

我无法在http://play.golang.org/上的go操场上找到可以导入的软件包列表.我试图使用(显然是实验性的)ebnf包.但是,即使是短程序也不会导入golang.org(第4行导入中断):

package main

import "fmt"
import "golang.org/x/exp/ebnf"

const g = `
Production  = name "=" [ Expression ] "." .
Expression  = Alternative { "|" Alternative } .
Alternative = Term { Term } .
Term        = name | token [ "…" token ] | Group | Option | Repetition .
Group       = "(" Expression ")" .
Option      = "[" Expression "]" .
Repetition  = "{" Expression "}" .`

func main() {
    fmt.Println(g)
} …