Check if Readline is defined before getting screen size
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@ -54,7 +54,7 @@ class Pry::Terminal
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end
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def screen_size_according_to_readline
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if Readline.respond_to?(:get_screen_size)
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if defined?(Readline) && Readline.respond_to?(:get_screen_size)
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size = Readline.get_screen_size
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size if nonzero_column?(size)
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end
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