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merge revision(s) 47973: [Backport #10392]

    * parse.y (parser_here_document): do not append already appended
      and disposed code fragment.  [ruby-dev:48647] [Bug #10392]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@47989 b2dd03c8-39d4-4d8f-98ff-823fe69b080e