18 Ok(match node {
Web streams are complex for users and implementers alike. The problems with the spec aren't bugs. They emerge from using the API exactly as designed. They aren't issues that can be fixed solely through incremental improvements. They're consequences of fundamental design choices. To improve things we need different foundations.
。PDF资料对此有专业解读
A value that is either some(T) or none，推荐阅读新收录的资料获取更多信息
More recently, there are a new wave of command-line libraries like the Python Prompt Toolkit, the Fish Shell and the Ammonite Scala REPL (My own project) that provide a richer command-line experience than traditional Readline/JLine based command-lines, with features like syntax-highlighted input and multi-line editing: