是什么导致该程序导致错误？

Question

run this program.

package main

import "fmt"

func main() {
    var a []interface{}
    a = make([]interface{}, 0, 10)
    a = append(a,
        append(a, 1))
    fmt.Println(a)
}

cause this error.

runtime: goroutine stack exceeds 1000000000-byte limit
fatal error: stack overflow

But no error occurs when run without fmt.Println.

Please tell me the reason!