# File lib/ruby_lexer.rb, line 515
  def tokadd_escape term # 20 lines
    case
    when src.scan(/\\\n/) then
      # just ignore
    when src.scan(/\\([0-7]{1,3}|x[0-9a-fA-F]{1,2})/) then
      self.string_buffer << src.matched
    when src.scan(/\\([MC]-|c)(?=\\)/) then
      self.string_buffer << src.matched
      self.tokadd_escape term
    when src.scan(/\\([MC]-|c)(.)/) then
      self.string_buffer << src.matched
    when src.scan(/\\[McCx]/) then
      rb_compile_error "Invalid escape character syntax"
    when src.scan(/\\(.)/m) then
      self.string_buffer << src.matched
    else
      rb_compile_error "Invalid escape character syntax"
    end
  end