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Backport #560 to Ruby 2.6 branch.
This PR tracks upstream commit ruby/ruby@8bf06cb.
xstring_contents
andstring_contents
rules are equivalent, so it doesn't change anything for parser.Ruby 2.6.3 has been released.
https://www.ruby-lang.org/en/news/2019/04/17/ruby-2-6-3-released/
This seems to be the only syntax change from Ruby 2.6.2 to Ruby 2.6.3.
ruby/ruby@v2_6_2...v2_6_3