fix: PR#249 depends on ruby2.6 infinite rage syntax #250
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#249
Sorry, my code depends on ruby2.6’s new infinite range syntax, it doesn't work well with ruby2.5.
https://github.com/zheng-yongping/iruby/blob/ac9763bbde4c7ce84c593cc376da2233c65e42c1/lib/iruby/kernel.rb#L108
when rindex return nil => ArgumentError (bad value for range)