merge revision(s) 4e038a7e64a9d52eed59b8f05647d4e58d265ec3: [Backport #5400]
Revert "parse.y: Deprecate flip-flops" This reverts commit bae638ad5b782c44c80efe33834cb9039279af46. [Feature #5400]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@67792 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 4e038a7e64a9d52eed59b8f05647d4e58d265ec3: [Backport #5400]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@67792 b2dd03c8-39d4-4d8f-98ff-823fe69b080e