# File lib/code_analyzer/sexp.rb, line 642
  def hash_keys
    pair_nodes = case sexp_type
                 when :bare_assoc_hash
                   self[1]
                 when :hash
                   self[1][1]
                 else
                 end
    if pair_nodes
      keys = []
      pair_nodes.size.times do |i|
        keys << pair_nodes[i][1].to_s
      end
      keys
    end
  end