class SyntaxTree::RangeNode

One of the sides of the expression may be nil, but not both.
end
if value == 5 .. value == 10
Sometimes this operator is used to create a flip-flop.
1..2
expressions. Usually this is to create a range object.
RangeNode represents using the .. or the … operator between two

def ===(other) 

def ===(other)
  other.is_a?(RangeNode) && left === other.left &&
    operator === other.operator && right === other.right
end

def accept(visitor) 

def accept(visitor)
  visitor.visit_range(self)
end

def child_nodes 

def child_nodes
  [left, right]
end

def copy(left: nil, operator: nil, right: nil, location: nil) 

def copy(left: nil, operator: nil, right: nil, location: nil)
  node =
    RangeNode.new(
      left: left || self.left,
      operator: operator || self.operator,
      right: right || self.right,
      location: location || self.location
    )
  node.comments.concat(comments.map(&:copy))
  node
end

def deconstruct_keys(_keys) 

def deconstruct_keys(_keys)
  {
    left: left,
    operator: operator,
    right: right,
    location: location,
    comments: comments
  }
end

def format(q) 

def format(q)
  q.format(left) if left
  case q.parent
  when IfNode, UnlessNode
    q.text(" #{operator.value} ")
  else
    q.text(operator.value)
  end
  q.format(right) if right
end

def initialize(left:, operator:, right:, location:) 

def initialize(left:, operator:, right:, location:)
  @left = left
  @operator = operator
  @right = right
  @location = location
  @comments = []
end