From: Ryan Davis <ryand-ruby@...>
Date: 2010-01-07T13:44:35+09:00
Subject: Re: Ruby in Lisp, preLisp


On Jan 6, 2010, at 19:57 , Albert Schlef wrote:

> Charles Nutter wrote:
>> As someone who's been working on a Ruby impl for the past 4 years, I
>> can say that interpreting Ruby is not necessarily the hardest
>> part...what actually takes forever (almost literally forever) is
>> getting all the core classes behaving correctly. RubySpec and the
>> various test suites we use in JRuby have helped that process, but
>> there's still a lot of edge cases you have to use to discover.
> 
> Can you give one or two examples (for an edge-case)?

A few easy ones off the top of my head are Array#pack, String#unpack, and String#[]. Amazing amount of edge cases on all of those, just getting complete test coverage for them is difficult.