为什么fmt允许使用空括号？

Question

I was just wondering why these brackets haven't been removed after running go fmt, does their use have a function?

package main

import "fmt"

func main() {

    fmt.Println("Hello, 世界")

    {
        {
            {

            }

        }
    }
}

Example here, thanks.

Answer 1

Brackets on their own denote code Blocks. From the spec:

A block is a possibly empty sequence of declarations and statements within matching brace brackets.

These are part of the Go syntax, and go fmt formats them according the its formatting rules.