Benchmark For with(out) range

// goos: linux
// goarch: amd64
// BenchmarkFor-4             30000             40441 ns/op
// BenchmarkRange-4           20000             80434 ns/op
// PASS

package main

import "testing"

var s = make([]byte, 73437, 73437)

func BenchmarkFor(b *testing.B) {
        for i := 0; i != b.N; i++ {
                for j := 0; j < len(s); j++ {
                        s[j] = 65
                }
        }
}

func BenchmarkRange(b *testing.B) {
        for i := 0; i != b.N; i++ {
                for j := range s {
                        s[j] = 65
                }
        }
}