# File lib/active_support/breakpoint.rb, line 103
  def breakpoint(id = nil, context = nil, &block)
    callstack = caller
    callstack.slice!(0, 3) if callstack.first["breakpoint"]
    file, line, method = *callstack.first.match(/^(.+?):(\d+)(?::in `(.*?)')?/).captures

    message = "Executing break point " + (id ? "#{id.inspect} " : "") +
              "at #{file}:#{line}" + (method ? " in `#{method}'" : "")

    if context then
      return handle_breakpoint(context, message, file, line, &block)
    end

    Binding.of_caller do |binding_context|
      handle_breakpoint(binding_context, message, file, line, &block)
    end
  end