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  <author_name>zehnpaard</author_name>
  <author_url>https://blog.hatena.ne.jp/zehnpaard/</author_url>
  <blog_title>Arantium Maestum</blog_title>
  <blog_url>https://zehnpaard.hatenablog.com/</blog_url>
  <categories>
    <anon>OCaml</anon>
  </categories>
  <description>発端は@dico_lequeさんのこのツイート そういえばOCamlでtype t = [ atom | `List of t list | `DottedList of t list * atom ]and atom = [ `Int of int | `Vector of t array ]みたいなのはThe type constructor atom is not yet completely definedになってしまうのだなあとしていた— でこれき (@dico_leque) November 22, 2020 そしてこのツイート constraint使う方は今でも通るか:type …</description>
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  <provider_name>Hatena Blog</provider_name>
  <provider_url>https://hatena.blog</provider_url>
  <published>2020-11-26 08:11:31</published>
  <title>OCamlでの相互再帰的なPolymorphic Variantに関するメモ</title>
  <type>rich</type>
  <url>https://zehnpaard.hatenablog.com/entry/2020/11/26/081131</url>
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