How to call Printf in a goroutine without hanging

goroutine_printf.go

package main

import (
    "fmt"
    "os"
    )

func PrintInts() {
    for i := 0; ; i++ {
        fmt.Printf("%d\r", i)
    }
}

func main() {
    go PrintInts()
    for {
        // With the next line, the program just hangs.
        os.Stdout.Sync()
    }
}