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merge revision(s) 53398: [Backport #11871]

    * parse.y (parser_here_document): update indent for each line in
      indented here document with single-quotes.
      [ruby-core:72479] [Bug #11871]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@54398 b2dd03c8-39d4-4d8f-98ff-823fe69b080e