Go Format rewrite rule

rewrite.sh

gofmt -r 'a[b:len(a)] -> a[b:]' h.go

rewrite_after.go

package main

import "fmt"

func main() {
	var a = []int{1, 2, 3, 4, 5}
	var c = 2
	fmt.Println(a[c:])
}

rewrite_before.go

package main

import "fmt"

func main() {
	var a = []int { 1,2,3,4,5 }
	var c = 2
	fmt.Println(a[c:len(a)])
}