iolanguage - Io语言: Exception: Object does not respond to 'URL'

Question

今天我正在练习“七周七种语言”的 Io 示例。

示例代码:

futureResult := URL with("http://google.com/") @fetch
writeln("Do something immediately while fetch goes on in background...")

writeln("This will block until the result is available.")

writeln("fetched ", futureResult size, " bytes")

运行时出现异常:

Io$ io future.io

  Exception: Object does not respond to 'URL'
  ---------
  Object URL                           future.io 1
  CLI doFile                           Z_CLI.io 140
  CLI run                              IoState_runCLI() 1

直接在io中运行URL，出现以下错误:

~$ io
Io 20110905
Io> URL

  Exception: Object does not respond to 'URL'
  ---------
  Object URL                           Command Line 1

Io> 

我的环境是:

Ubuntu 14.04

Answer 1

已关注 post ，我做了以下工作:

$ sudo apt-get install libevent-dev
$ ./build.sh
$ ./build.sh install

网址错误已修复。 但抛出以下错误:

Do something immediately while fetch goes on in background... This will block until the result is available. fetched Exception: Error does not respond to 'size' --------- Error size
future.io 6 Error size future.io 6 CLI doFile Z_CLI.io 140 CLI run
IoState_runCLI() 1

Post帮助安装 Io