Ruby

ripper/lexer.rb: nested indented heredoc

• ext/ripper/lib/ripper/lexer.rb (on_heredoc_dedent): fix for
  nested indedented here documents, where Elems are nested too.
  [ruby-core:80977] [Bug #13536]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58545 b2dd03c8-39d4-4d8f-98ff-823fe69b080e