STDIN don't accept nil
getswill retunnilif we press Ctrl-Dgets.not_nil!will raise an exception
# x = gets
# puts x.nil?
x = gets.not_nil!
puts x.nil?
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gets will retun nil if we press Ctrl-Dgets.not_nil! will raise an exception# x = gets
# puts x.nil?
x = gets.not_nil!
puts x.nil?