golang ... 可变参数并不是展开传递的

demo.go

package main

import "log"

func test(data ...interface{}) {
	for _, i := range data {
		log.Printf("data: %v", i)
	}
}

func main() {
	a := []int{1, 2, 3, 4}
	// cannot use a (type []int) as type []interface {} in argument to test
	test(a...)
}