mention pry-coolline as an alternative when 'readline' is unavailable.
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@ -105,6 +105,7 @@ private
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warn "Possible solutions:"
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warn " * Rebuild Ruby with Readline support using `--with-readline`"
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warn " * Use the rb-readline gem, which is a pure-Ruby port of Readline"
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warn " * Use the pry-coolline gem, a pure-ruby alternative to Readline"
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raise
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end
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