This is great, but I want the other things that are important but forgotten: " We will not have: A proper type system Error handling Good performance And much

This is great, but I want the other things that are important but forgotten: " We will not have: A proper type system Error handling Good performance And much, much more " Good performance is something that have a lot of literature, so can be avoided in this tutorials. I have been in this talk at lambda: http://lambda-the-ultimate.org/node/4929#comment-79628 http://lambda-the-ultimate.org/node/4929#comment-79628 Where is discussed where to talk about implement compilers. I ask about the other things that bother me: - Debugger/ Debugging experience - REPL - Tracing (ie: Dtrace or similar) and other things that I wish to understand before just make another parser. How build a "hacker news" for it? Exist some project I could use?