{"image_url":null,"author_name":"shigemk2","version":"1.0","type":"rich","url":"https://www.shigemk2.com/entry/unreachable_code","provider_name":"Hatena Blog","width":"100%","title":"unreachable code","blog_url":"https://www.shigemk2.com/","provider_url":"https://hatena.blog","categories":["Scala"],"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fwww.shigemk2.com%2Fentry%2Funreachable_code\" title=\"unreachable code - by shigemk2\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","published":"2015-07-08 23:18:54","description":"Scala compiler says unreachable code, why?stackoverflow.com def ack2(m: BigInt, n: BigInt): BigInt = { val z = BigInt(0) (m,n) match { case (z,_) => n+1 case (_,z) => ack2(m-1,1) // unreachable code case _ => ack2(m-1, ack2(m, n-1)) // unreachable code } } println(ack2(1, 0)) \u3053\u3093\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u3044\u305f\u6642\u306b\u3001\u30b3\u30e1\u30f3\u30c8\u306e\u3068\u3053\u308d\u3067u\u2026","blog_title":"by shigemk2","height":"190","author_url":"https://blog.hatena.ne.jp/shigemk2/"}