[ruby/irb] Revert "Reidline mode needs Reline what needs String#grapheme_clusters"
This reverts commit 2b0b19b87c60d2cdb329979acbb96e12a1f940e7.
New IRB parser needs new Ripper what has lex_state too. The new Ripper is adopted by Ruby 2.5 or later.
https://github.com/ruby/irb/commit/9ab6e35a2c
[ruby/irb] Revert "Reidline mode needs Reline what needs String#grapheme_clusters"
This reverts commit 2b0b19b87c60d2cdb329979acbb96e12a1f940e7.
New IRB parser needs new Ripper what has lex_state too. The new Ripper is
adopted by Ruby 2.5 or later.
https://github.com/ruby/irb/commit/9ab6e35a2c