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object Main { | |
def head[A](list: List[A]): A = list.head | |
def x1: List[Int] | List[String] = List(3) | |
// この変換は可能。逆の変換は無理 | |
def x2: List[Int | String] = x1 | |
def x3 = head(x1) | |
def x4 = head(x2) | |
x3 : (Int | String) // Matchableになってしまってコンパイルエラー | |
x4 : (Int | String) // これは成功 | |
} |
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