class RuboCop::Cop::Lint::FlipFlop

end
puts x if (x >= 5) && (x <= 10)
(1..20).each do |x|
# good
end
puts x if (x == 5) .. (x == 10)
(1..20).each do |x|
# bad
@example
flip-flop operator is deprecated since Ruby 2.6.0.
This cop looks for uses of flip-flop operator.

def on_eflipflop(node) 

def on_eflipflop(node)
  add_offense(node)
end

def on_iflipflop(node) 

def on_iflipflop(node)
  add_offense(node)
end