to_yaml

# File lib/rubygems/specification.rb, line 2592
  def to_yaml(opts = {}) # :nodoc:
    # Because the user can switch the YAML engine behind our
    # back, we have to check again here to make sure that our
    # psych code was properly loaded, and load it if not.
    unless Gem.const_defined?(:NoAliasYAMLTree)
      require 'rubygems/psych_tree'
    end

    builder = Gem::NoAliasYAMLTree.create
    builder << self
    ast = builder.tree

    io = StringIO.new
    io.set_encoding Encoding::UTF_8

    Psych::Visitors::Emitter.new(io).accept(ast)

    io.string.gsub(/ !!null \n/, " \n")
  end