[ruby/irb] Use Ripper::Lexer#scan to take broken tokens
ref. https://github.com/ruby/reline/pull/242
https://github.com/ruby/irb/commit/54f90cb6c9
[ruby/irb] Use Ripper::Lexer#scan to take broken tokens
ref. https://github.com/ruby/reline/pull/242
https://github.com/ruby/irb/commit/54f90cb6c9