d2.go

import (
    "io"
    "strings"
)

func main() {
    r1 := strings.NewReader("first reader ")
    r2 := strings.NewReader("second reader ")
    r3 := strings.NewReader("third reader")
    r := io.MultiReader(r1, r2, r3)

    io.Copy(os.Stdout, r)
    // Output: first reader second reader third reader
}