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test
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goroutine: go say("world") が動き出す前に main の処理が終了するからでしょうね。
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main の終了を少しだけ待たせる↓とどうなりますか?
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```Go
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package main
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import (
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"fmt"
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"time"
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)
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func say(s string) {
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for i := 0; i < 5; i++ {
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// time.Sleep(100 * time.Millisecond)
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fmt.Println(s)
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}
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}
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func main() {
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go say("world")
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say("hello")
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time.Sleep(100 * time.Millisecond) // ここで小休止
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}
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```
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