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Some features of irb do not work properly when using the old rdoc. I have compared several major versions and found that it works as intended from 4.0.0.
This problem occurs when there is a Gemfile.lock is installed with the old rdoc. I don't know why this Gemfile.lock installs an older rdoc than the ruby bundled rdoc, but specifying the version in the gemspec will at least prevent the problem.
NOTE: #704 problem does not occur with this change.
The following is test code.
Simply updating the version of rdoc specified in Gemfile.lock will solve the problem, so if there is a problem with this PR, it is ok to close it.