breakpoint (Breakpoint)

    # 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