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commit b879d6e1d72651af6317e67eaa129d5c9be62e40
  Author:     Nobuyoshi Nakada <nobu@ruby-lang.org>
  AuthorDate: 2019-12-02 08:08:31 +0900
  Commit:     Nobuyoshi Nakada <nobu@ruby-lang.org>
  CommitDate: 2019-12-02 08:09:04 +0900

    Added the toplevel method