function var_dump(data, max_level, prefix)       if type(prefix) ~= "string" then           prefix = ""      end       if type(data) ~= "table" then           print(prefix .. tostring(data))       else          print(data)           if max_level ~= 0 then               local prefix_next = prefix .. "    "              print(prefix .. "{")               for k,v in pairs(data) do                  io.stdout:write(prefix_next .. k .. " = ")                   if type(v) ~= "table" or (type(max_level) == "number" and max_level <= 1) then                       print(v)                   else                      if max_level == nil then                           var_dump(v, nil, prefix_next)                       else                          var_dump(v, max_level - 1, prefix_next)                       end                   end               end               print(prefix .. "}")           end       end   end