Convert Go slice in interface{} to []interface{}

slice.go

package main

import (
	"fmt"
	"reflect"
)

func convertInterfaceToSlice(slice interface{}) ([]interface{}, error) {
	val := reflect.ValueOf(slice)
	if val.Kind() != reflect.Slice {
		return nil, fmt.Errorf("Cannot convert value of kind %s to slice", val.Kind().String())
	}

	niceSlice := make([]interface{}, val.Len())

	for i := 0; i < val.Len(); i++ {
		niceSlice[i] = val.Index(i).Interface()
	}

	return niceSlice, nil
}