class Unparser::Emitter::XStr

def emit_heredoc
  write(%(<<~`HEREDOC`))
  buffer.indent
  nl
  children.each do |child|
    if n_str?(child)
      write(child.children.first)
    else
      emit_begin(child)
    end
  end
  buffer.unindent
  write("HEREDOC\n")
end