型注釈について追記。 close #493 #496
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Nil周りで型注釈を付ける必要がある場合があるが、その解説がない件（ #493 ）への対応。Scalaの型理論・型推論よくわかってないので、とりあえずふわっと書いてみましたが、妥当がどうかは意見いただきたいです。