class RuboCop::Cop::Lint::DuplicateBranch

def literal_branch?(branch) # rubocop:disable Metrics/CyclomaticComplexity
  return false if !branch.literal? || branch.xstr_type?
  return true if branch.basic_literal?
  branch.each_descendant.all? do |node|
    node.basic_literal? ||
      node.pair_type? || # hash keys and values are contained within a `pair` node
      (node.const_type? && ignore_constant_branches?)
  end
end