[ruby/irb] Decouple RubyLex from prompt and line_no (https://github.com/ruby/irb/pull/701)
Remove instance variable prompt and line_no from RubyLex
Fix prompt test
Rename prompt generating method and make it private
https://github.com/ruby/irb/commit/1ceb97fe2e
[ruby/irb] Decouple RubyLex from prompt and line_no
(https://github.com/ruby/irb/pull/701)
Remove instance variable prompt and line_no from RubyLex
Fix prompt test
Rename prompt generating method and make it private
https://github.com/ruby/irb/commit/1ceb97fe2e