Any ideas why this doesn't work?

main.go

package main

import (
  "sync"
  "fmt"
  "time"
)

func merge(inputs []chan interface{}) chan interface{} {
  var group sync.WaitGroup
  var output chan interface{}
  for i := range inputs {
    group.Add(1)
    go func(input chan interface{}) {
      for val := range input { output <- val }
      group.Done()
    } (inputs[i])
  }
  go func() {
    group.Wait()
    close(output)
  } ()
  return output
}

func main() {
  var channels []chan interface{}
  for x := 0; x < 3; x++ {
    channels = append(channels, make(chan interface{}))
    channels[x] <- x
    close(channels[x])
  }
  merged := merge(channels)
  loop:
  for {
    select {
    case i := <-merged:
      fmt.Println(i)
    case <- time.After(3*time.Second):
      fmt.Println("Breaking loop")
      break loop
    }
  }
}